QUIZ on pH, acids, bases, salts & neutralisation easier-foundation tier GCSE level Doc Brown's Chemistry

The reaction illustrated produces ...? [ab-1]
1. a salt + water
2. a salt only
3. a salt and hydrogen
4. water only
The type of reaction illustrated is called ...? [ab-2]
1. decomposition
2. neutralisation
3. displacement
4. oxidation
To produce sodium sulfate by the reaction illustrated you need ...? [ab-3]
1. potassium sulfate + sodium hydroxide
2. sodium chloride + sulfuric acid
3. sodium hydroxide + sulfuric acid
4. sodium hydroxide + hydrochloric acid
In the reaction illustrated, in order to add the correct amount of acid you would add a few drops of Universal Indicator and add acid until the indicator in the conical flask was ...? [ab-4]
1. blue
2. orange
3. yellow
4. green
In the reaction illustrated, in order to add the correct amount of acid you would add a few drops of Universal Indicator to the conical flask. If too little acid was added the indicator colour could be? [ab-5]
1. blue
2. orange
3. yellow
4. green
In the reaction illustrated, in order to add the correct amount of acid you would add a few drops of Universal Indicator to the conical flask. If too much acid was added the indicator colour could be? [ab-6]
1. blue
2. orange
3. purple
4. green
To produce potassium chloride by the reaction illustrated you need ...? [ab-7]
1. potassium sulfate + hydrochloric acid
2. sodium chloride + potassium hydroxide
3. potassium hydroxide + hydrochloric acid
4. sodium hydroxide + hydrochloric acid
To produce lithium nitrate by the reaction illustrated you need ...? [ab-8]
1. lithium sulfate + nitric acid
2. sodium nitrate + lithium hydroxide
3. potassium nitrate + lithium hydroxide
4. lithium hydroxide + nitric acid
The diagram shows a method of preparing salts.
Which of the following will forms when a transition metal oxide reacts with hydrochloric acid? [ab-9]
1. transition metal chloride + water
2. transition metal chloride + hydrogen
3. transition metal chloride only
4. water only
The diagram shows a method of preparing salts from reacting an insoluble metal oxide and an acid.
This type of reaction is called? [ab-10]
1. electrolysis
2. neutralisation
3. reduction
4. displacement
The diagram shows a method of preparing salts by reacting an insoluble metal oxide with an acid.
How can you tell when all the acid has been used up before filtering the mixture? [ab-11]
1. universal indicator will give a yellow colour in the acid
2. universal indicator will give a pale blue colour in the acid
3. no more of the metal oxide will dissolve in the acid
4. the solution will go clear
The diagram shows a method of preparing salts.
Which of the following will form a transition metal sulfate and hydrogen? [ab-12]
1. transition metal oxide + sulfuric acid
2. transition metal + sodium sulfate
3. transition metal hydroxide + potassium sulfate
4. transition metal + sulfuric acid
Which is the strongest base or alkali? [ab-13]
1. limewater
2. baking soda
3. vinegar
4. wine
Which is the weakest base or alkali? [ab-14]
1. limewater
2. baking soda
3. vinegar
4. wine
Which is the strongest acid? [ab-15]
1. limewater
2. baking soda
3. vinegar
4. wine
Which is the weakest acid? [ab-16]
1. limewater
2. baking soda
3. vinegar
4. wine
Which of the following can be mixed to form a neutral solution? [ab-17]
1. limewater and fizzy drink
2. baking soda and toothpaste
3. vinegar and wine
4. calamine lotion and common salt
Which of the following can be mixed to form a neutral solution? [ab-18]
1. limewater and washing soda
2. baking soda and wine
3. vinegar and common salt
4. ammonia and limewater
Which of the following can be safely used to treat an acid bee sting? [ab-19]
1. limewater
2. wine
3. calamine lotion
4. common salt
Which of the following can be safely used to treat an alkaline wasp sting? [ab-20]
1. calamine lotion
2. vinegar
3. washing soda
4. common salt
Which of the following is most likely to be part of an ant-acid indigestion medicine? [ab-21]
1. sodium hydrogencarbonate
2. ammonia
3. washing soda
4. limewater
Which of the following is the safest to use to treat an acid nettle sting? [ab-22]
1. wine
2. sodium hydrogencarbonate
3. washing soda
4. limewater
A small amount of a dense white powder was mixed with water in a test tube. Non of the white powder sank to the bottom of the test tube. A few drops of universal indicator were added and the solution turned blue. This meant the white powder was ...? [ab-23]
1. a soluble neutral substance
2. a slightly soluble acid
3. a very soluble alkali
4. a slightly soluble alkali
A small amount of a dense white powder was mixed with water in a test tube. Some of the white powder sank to the bottom of the test tube. A few drops of universal indicator were added and the solution turned blue. This meant the white powder was ...? [ab-24]
1. a soluble neutral substance
2. a slightly soluble acid
3. a very soluble alkali
4. a slightly soluble alkali
A small amount of a dense white powder was mixed with water in a test tube. Non of the white powder sank to the bottom of the test tube. A few drops of universal indicator were added and the solution turned green. This meant the white powder was ...? [ab-25]
1. a soluble neutral substance
2. a slightly soluble acid
3. a slightly soluble neutral substance
4. a slightly soluble alkali
A small amount of a dense white powder was mixed with water in a test tube. Some of the white powder sank to the bottom of the test tube. A few drops of universal indicator were added and the solution turned green. This meant the white powder was ...? [ab-26]
1. a soluble acidic substance
2. a slightly soluble neutral substance
3. a soluble acidic substance
4. a slightly soluble alkali
A small amount of a dense white powder was mixed with water in a test tube. Non of the white powder sank to the bottom of the test tube. A few drops of universal indicator were added and the solution turned orange. This meant the white powder was ...? [ab-27]
1. a soluble weak alkali
2. a very soluble neutral substance
3. a soluble weak acid
4. a slightly soluble strong acid
A small amount of a dense white powder was mixed with water in a test tube. Some of the white powder sank to the bottom of the test tube. A few drops of universal indicator were added and the solution turned red. This meant the white powder was ...? [ab-28]
1. a soluble weak alkali
2. a slightly soluble neutral substance
3. a soluble weak acid
4. a slightly soluble strong acid
Which of the following is the pH of a strong acid? [ab-49]
1. pH 1
2. pH 14
3. pH 5
4. pH 9
Which of the following is the pH of a strong alkali? [ab-50]
1. pH 1
2. pH 14
3. pH 5
4. pH 9
Which of the following is the pH of a weak acid? [ab-51]
1. pH 1
2. pH 14
3. pH 5
4. pH 9
Which of the following is the pH of a weak alkali? [ab-52]
1. pH 1
2. pH 14
3. pH 5
4. pH 9
When dilute nitric acid reacts with sodium hydroxide the products are? [ab-53]
1. sodium nitrate + water
2. sodium nitrate + hydrogen
3. sodium hydride + hydrogen nitrate
4. sodium nitrite + oxygen
dilute acid X + copper(II) carbonate ==> copper(II) sulfate + water + carbon dioxide. Acid X is? [ab-54]
1. nitric acid
2. sulfuric acid
3. sulfurous acid
4. hydrochloric acid
dilute acid X + magnesium hydroxide ==> magnesium chloride + water. Acid X is? [ab-55]
1. ammonium chlorate
2. sulfuric acid
3. hydrochloric acid
4. chloric acid
magnesium + dilute acid X ==> magnesium nitrate + hydrogen. Acid X is? [ab-56]
1. ammonium nitrate
2. nitrogen dioxide
3. nitrous acid
4. nitric acid
When hydrochloric acid is added to copper carbonate, the gas bubbles formed can be identified by? [ab-57]
1. burning with a squeaky pop
2. turning limewater cloudy
3. relighting a glowing splint
4. turning blue litmus red and then bleaching it
When sulfuric acid is added to zinc, the gas bubbles formed can be identified by? [ab-58]
1. burning with a squeaky pop
2. turning limewater cloudy
3. relighting a glowing splint
4. turning blue litmus red and then bleaching it
An iron tray was cleaned with dilute hydrochloric acid and bubbles formed. The gas formed was? [ab-59]
1. oxygen
2. chlorine
3. hydrogen
4. carbon dioxide
A carbonate mineral rock was tested with dilute sulfuric acid and bubbles formed. The gas formed was? [ab-60]
1. carbon monoxide
2. sulfur dioxide
3. hydrogen
4. carbon dioxide
Dilute sulfuric acid will only form one product when reacted with? [ab-61]
1. ammonia
2. copper
3. magnesium oxide
4. zinc carbonate
Dilute sulfuric acid will not readily react with? [ab-62]
1. ammonia
2. copper
3. magnesium oxide
4. zinc carbonate
Which will form a salt and water when reacted with dilute hydrochloric acid? [ab-63]
1. ammonia
2. copper
3. magnesium oxide
4. zinc carbonate
Which will form a salt, water and carbon dioxide when reacted with dilute hydrochloric acid? [ab-64]
1. ammonia
2. copper
3. magnesium oxide
4. zinc carbonate
Which of these reactants is the best combination to use to make magnesium sulfate? [ab-65]
1. magnesium oxide + sulfuric acid
2. magnesium chloride + sodium sulfate
3. sulfuric acid + magnesium chloride
4. magnesium nitrate + sulfuric acid
Which of these reactants is the best combination to use to make zinc nitrate? [ab-66]
1. zinc chloride + nitric acid
2. nitric acid + zinc hydroxide
3. nitric acid + zinc sulfate
4. zinc oxide + nitrous acid
Which of these reactants is the best combination to use to make copper(II) sulfate? [ab-67]
1. copper + sulfuric acid
2. copper(II) chloride + sodium sulfate
3. copper(II) oxide + sulfuric acid
4. copper(II) nitrate + sodium chloride
Which of these reactants is the best combination to use to make zinc chloride? [ab-68]
1. calcium chloride + zinc carbonate
2. zinc nitrate + hydrochloric acid
3. sodium chloride + zinc oxide
4. zinc carbonate + hydrochloric acid
The diagram shows the preparation of a salt. Which word applies to stages 1-2? [ab-69]
1. neutralisation
2. filtration
3. evaporation
4. condensation
The diagram shows the preparation of a salt. Which word applies to stage 3? [ab-70]
1. neutralisation
2. filtration
3. evaporation
4. condensation
The diagram shows the preparation of a salt. Which word describes the change from 3 to 4? [ab-71]
1. neutralisation
2. filtration
3. evaporation
4. condensation
The diagram shows the preparation of a salt. Which word describes stage 4? [ab-72]
1. neutralisation
2. filtration
3. evaporation
4. crystallisation
The diagram shows the preparation of a salt using a solid and an acid. Which is true concerning this method? [ab-73]
1. the solid can be an insoluble base
2. it is not a neutralisation reaction
3. you cannot use an insoluble carbonate
4. the solid must be an alkali
The diagram shows the preparation of a salt. Which word means a 'soluble base'? [ab-74]
1. oxide
2. alkali
3. hydroxide
4. indicator
The diagram shows a method of salt preparation. Which statement is true about the method? [ab-75]
1. the method uses an insoluble base
2. the acid must be in the burette and the alkali in the flask
3. the neutralisation point is detected with an indicator
4. the salt will precipitate at the neutralisation point
The diagram shows one method of salt preparation. Which statement is true about the method illustrated? [ab-76]
1. the salt will precipitate at the neutralisation point
2. an alkali is used
3. the neutralisation point is detected with an indicator
4. the method uses an insoluble base
Complete the word equation:
zinc oxide + hydrochloric acid ==> ..???.. [ab-77]
1. zinc chloride + hydrogen
2. zinc hydrochloride + water
3. zinc chloride + water
4. zinc hydrochloride chloride + water + carbon dioxide
Complete the word equation:
zinc hydroxide + hydrochloric acid ==> ..???.. [ab-78]
1. zinc hydrochloride + water
2. zinc chloride + water + carbon dioxide
3. zinc hydrochloride + hydrogen
4. zinc chloride + water
Complete the word equation:
zinc + hydrochloric acid ==> ..???.. [ab-79]
1. zinc chloride + hydrogen
2. zinc chloride + water
3. zinc hydrochloride + hydrogen
4. zinc hydrochloride + water
Complete the word equation:
zinc carbonate + hydrochloric acid ==> ..???.. [ab-80]
1. zinc hydrochloride + water
2. zinc chloride + water + carbon dioxide
3. zinc hydrochloride + hydrogen
4. zinc chloride + carbon dioxide
Complete the word equation:
nickel + sulfuric acid ==> ..???.. [ab-81]
1. nickel sulfate + hydrogen
2. nickel sulfate + water
3. nickel sulfite + water
4. nickel sulfite + hydrogen
Complete the word equation:
nickel oxide + sulfuric acid ==> ..???.. [ab-82]
1. nickel sulfate + hydrogen
2. nickel sulfate + water
3. nickel sulfite + water
4. nickel sulfite + hydrogen
Complete the word equation:
nickel hydroxide + sulfuric acid ==> ..???.. [ab-83]
1. nickel sulfate + hydrogen
2. nickel sulfite + water
3. nickel sulfate + water
4. nickel sulfite + hydrogen
Complete the word equation:
nickel carbonate + sulfuric acid ==> ..???.. [ab-84]
1. nickel sulfate + carbon dioxide
2. nickel sulfite + water
3. nickel sulfate + water
4. nickel sulfate + water + carbon dioxide
Complete the word equation:
ammonia + sulfuric acid ==> ..???.. [ab-85]
1. ammonium sulfate
2. ammonia sulfate
3. ammonium hydrogensulfate
4. ammonia sulfite
Complete the word equation:
ammonia + hydrochloric acid ==> ..???.. [ab-86]
1. ammonia chloride
2. ammonium chloride
3. ammonium hydrochloride
4. ammonia hydrochloride
Complete the word equation:
ammonia + nitric acid ==> ..???.. [ab-87]
1. ammonia nitrite
2. ammonium nitrite
3. ammonium nitrate
4. ammonia hydrogennitrate
Complete the word equation:
sodium hydroxide + sulfuric acid ===> ..???.. [ab-88]
1. sodium sulfate
2. sodium sulfate + hydrogen
3. sodium hydrogensulfite + water
4. sodium sulfate + water
Given the following neutralisation equation:
NaOH_(aq) + HCl_(aq) ==> NaCl_(aq) + H₂O_(l)
Which is the alkali? [ab-89]
1. NaOH
2. HCl
3. NaCl
4. H₂O
Given the following neutralisation equation:
NaOH_(aq) + HCl_(aq) ==> NaCl_(aq) + H₂O_(l)
Which is the acid? [ab-90]
1. NaOH
2. HCl
3. NaCl
4. H₂O
Given the following neutralisation equation:
NaOH_(aq) + HCl_(aq) ==> NaCl_(aq) + H₂O_(l)
Which is the salt? [ab-91]
1. NaOH
2. HCl
3. NaCl
4. H₂O
Given the following neutralisation equation:
NaOH_(aq) + HCl_(aq) ==> NaCl_(aq) + H₂O_(l)
Which is the base? [ab-92]
1. H₂O
2. HCl
3. NaCl
4. NaOH
Which two reactants would you use to make potassium nitrate? [ab-101]
1. nitric acid and potassium hydroxide
2. sodium nitrate and potassium chloride
3. sulfuric acid and sodium nitrate
4. nitric acid and sodium hydroxide
Insoluble metal oxides and metal hydroxides (bases) will not dissolve to form an alkaline solution. But they will dissolve in acids to give the same reaction as with alkalis. This method is particularly handy for making transition metal salts. Which reaction will produce a transition metal chloride and hydrogen? [ab-102]
1. transition metal oxide + sodium chloride
2. transition metal + hydrochloric acid
3. transition metal hydroxide + hydrochloric acid
4. transition metal + sulfuric acid
Insoluble metal oxides and metal hydroxides (bases) will not dissolve to form an alkaline solution. But they will dissolve in acids to give the same reaction as with alkalis. This method is particularly handy for making transition metal salts. When sufficient base has been added so that no more dissolves, how is the excess base removed? [ab-103]
1. boiling
2. distillation
3. filtration
4. crystallisation
Insoluble metal oxides and metal hydroxides (bases) will not dissolve to form an alkaline solution. But they will dissolve in acids to give the same reaction as with alkalis. This method is particularly handy for making transition metal salts. When sufficient base has been added so that no more dissolves. How could you test that all the acid was neutralised? [ab-104]
1. see if crystals form on evaporating the solution
2. see if the solution is clear
3. measure the boiling point of the solution
4. use indicator paper
Insoluble bases and metals will not dissolve to form an alkaline solution, but they will dissolve in acids to form salts. This method is particularly handy for making transition metal salts. What pair of chemicals will make cobalt sulfate and water? [ab-105]
1. cobalt oxide + sulfuric acid
2. cobalt + hydrochloric acid
3. cobalt + nitric acid
4. cobalt hydroxide + nitric acid
Insoluble bases and metals will not dissolve to form an alkaline solution, but they will dissolve in acids to form salts. This method is particularly handy for making transition metal salts. What pair of chemicals will make cobalt chloride and hydrogen? [ab-106]
1. cobalt oxide + sulfuric acid
2. cobalt + hydrochloric acid
3. cobalt hydroxide + sodium chloride
4. cobalt hydroxide + nitric acid
Which two reactants make ammonium chloride and water? [ab-107]
1. ammonium sulfate and hydrochloric acid
2. ammonium hydroxide and sodium chloride
3. ammonium hydroxide and hydrochloric acid
4. ammonia and potassium chloride
Which of these gives an alkaline solution when dissolved in water? [ab-108]
1. aluminium hydroxide
2. copper hydroxide
3. iron hydroxide
4. ammonia (ammonium hydroxide)
Which of these gives an alkaline solution when dissolved in water? [ab-109]
1. sodium hydroxide
2. copper hydroxide
3. iron hydroxide
4. aluminium hydroxide
Which of these gives an alkaline solution when dissolved in water? [ab-109]
1. nickel hydroxide
2. potassium hydroxide
3. iron hydroxide
4. magnesium hydroxide
Which of A to D completes the equation ..?.. [ab-111]
..?.. + potassium hydroxide ==> potassium sulfate + water
1. potassium nitrate
2. calcium hydroxide
3. sulfuric acid
4. sodium chloride
Which of A to D completes the equation ..?.. [ab-112]
hydrochloric acid + sodium hydroxide ==> ..?.. + water
1. sodium sulfate
2. potassium chloride
3. calcium chloride
4. sodium chloride
Which of A to D completes the equation ..?.. [ab-113]
..?.. + nitric acid ==> ammonium nitrate
1. ammonia (ammonium hydroxide)
2. calcium hydroxide
3. ammonium sulfate
4. sodium nitrate
Which of A to D completes the equation ..?.. [ab-114]
sulfuric acid + ..?.. ==> calcium sulfate + water
1. ammonia sulfate
2. calcium hydroxide
3. calcium chloride
4. sodium sulfate
Which of the following is a chemical test for the gas hydrogen? [id-01]
1. pops with lit splint
2. turns limewater cloudy
3. relights a glowing splint
4. bleaches damp litmus paper white
Which of the following is a chemical test for the gas carbon dioxide? [id-02]
1. pops with a lit splint
2. turns limewater cloudy/milky (white precipitate)
3. relights a glowing splint
4. bleaches damp litmus paper white
Which of the following is a chemical test for the gas oxygen? [id-03]
1. pops with a lit splint
2. turns limewater cloudy
3. relights a glowing splint
4. bleaches damp litmus paper white
Which of the following is a chemical test for the gas chlorine? [id-04]
1. pops with a lit splint
2. turns limewater cloudy
3. relights a glowing splint
4. bleaches damp litmus paper white
Which gas is formed when a metal reacts with an acid? [id-05]
1. hydrogen, H₂
2. carbon dioxide, CO₂
3. oxygen, O₂
4. chlorine, Cl₂
Which gas is formed when an acid reacts with a carbonate? [id-06]
1. hydrogen, H₂
2. carbon dioxide, CO₂
3. oxygen, O₂
4. chlorine, Cl₂
A gas turns damp red litmus paper blue. The gas is? [id-07]
1. carbon dioxide, CO₂
2. oxygen, O₂
3. ammonia, NH₃
4. sulfur dioxide, SO₂
A gas turns damp orange potassium dichromate(VI) paper green. The gas is? [id-08]
1. carbon dioxide, CO₂
2. oxygen, O₂
3. ammonia, NH₃
4. sulfur dioxide, SO₂
A brown solution of a substance turns dark blue when a drop of starch solution was added. The substance is most likely to be? [id-09]
1. iodine, I₂
2. chlorine, Cl₂
3. bromine, Br₂
4. sulfur dioxide, SO₂
Which of the following descriptions describes a simple chemical test for chloride ions in a solution? [id-10]
1. A few drops of dilute hydrochloric acid are added to the solution followed by a few drops of barium chloride or barium nitrate solution.
2. A few drops of dilute nitric acid are added to the solution followed by a few drops of silver nitrate solution.
3. A few cm³ of dilute hydrochloric acid is added and any gas formed is tested with limewater.
4. A few cm³ of dilute sodium hydroxide is added and any gas formed is tested with red litmus.
A few cm³ of dilute nitric acid followed by a few drops of silver nitrate solution is added to a solution of a salt. If a white precipitate forms, which ion from the salt is most likely to be in the solution? (Extra advanced level observation: The white precipitate dissolves in ammonia solution.) [id-11]
1. sulfate ion, SO₄^2-
2. chloride ion, Cl^-
3. bromide ion, Br^-
4. iodide ion, I^-
A few cm³ of dilute nitric acid followed by a few drops of silver nitrate solution is added to a solution of a salt. If a cream precipitate forms, which ion from the salt is most likely to be in the solution? (Extra advanced level observation: The cream precipitate slightly dissolves in conc. ammonia solution.) [id-12]
1. sulfate ion, SO₄^2-
2. chloride ion, Cl^-
3. bromide ion, Br^-
4. iodide ion, I^-
A few cm³ of dilute nitric acid followed by a few drops of silver nitrate solution is added to a solution of a salt. If a pale yellow precipitate forms, which ion from the salt is most likely to be in the solution? (Extra advanced level observation: The pale yellow precipitate is insoluble with conc. ammonia solution.) [id-13]
1. sulfate ion, SO₄^2-
2. chloride ion, Cl^-
3. bromide ion, Br^-
4. iodide ion, I^-
Which of the following descriptions describes a simple chemical test for sulfate ions in a solution? [id-14]
1. A few drops of dilute hydrochloric acid are added to the solution followed by a few drops of barium chloride or barium nitrate solution.
2. A few drops of dilute nitric acid are added to the solution followed by a few drops of silver nitrate solution.
3. A few cm³ of dilute hydrochloric acid is added and any gas formed is tested with limewater.
4. A few cm³ of dilute sodium hydroxide is added, the mixture gently warmed and any gas formed is tested with red litmus.
Which of the following descriptions describes a simple chemical test for carbonate ions in a solution? [id-15]
1. A few drops of dilute hydrochloric acid are added to the solution followed by a few drops of barium chloride or barium nitrate solution.
2. A few drops of dilute nitric acid are added to the solution followed by a few drops of silver nitrate solution.
3. A few cm³ of dilute hydrochloric acid is added and any gas formed is tested with limewater.
4. A few cm³ of dilute sodium hydroxide is added, the mixture gently warmed and any gas formed is tested with red litmus.
Which of the following descriptions describes a simple chemical test for ammonium ions in a solution? [id-16]
1. A few drops of dilute hydrochloric acid are added to the solution followed by a few drops of barium chloride or barium nitrate solution.
2. A few drops of dilute nitric acid are added to the solution followed by a few drops of silver nitrate solution.
3. A few cm³ of dilute hydrochloric acid is added and any gas formed is tested with limewater.
4. A few cm³ of dilute sodium hydroxide is added, the mixture gently warmed and any gas formed is tested with red litmus.
A few drops of sodium hydroxide solution was added to a metal salt solution. A dark green gelatinous precipitate was formed. Which metal ion (cation) was present in the salt solution? [id-17]
1. iron(II) ion, Fe²⁺
2. iron(III) ion, Fe³⁺
3. copper(II) ion, Cu²⁺
4. zinc ion, Zn²⁺
A few drops of sodium hydroxide solution was added to a metal salt solution. A brown gelatinous precipitate was formed. Which metal ion (cation) was present in the salt solution? [id-18]
1. iron(II) ion, Fe²⁺
2. iron(III) ion, Fe³⁺
3. copper(II) ion, Cu²⁺
4. zinc ion, Zn²⁺
A few drops of sodium hydroxide solution was added to a metal salt solution. A blue gelatinous precipitate was formed. Which metal ion (cation) was present in the salt solution? [id-19]
1. iron(II) ion, Fe²⁺
2. iron(III) ion, Fe³⁺
3. copper(II) ion, Cu²⁺
4. zinc ion, Zn²⁺
A few drops of sodium hydroxide solution was added to a metal salt solution. A white gelatinous precipitate was formed. Which metal ion (cation) was present in the salt solution? (Advanced level note: The white precipitate dissolves in excess dil. sodium hydroxide to give a clear colourless solution) [id-20]
1. iron(II) ion, Fe²⁺
2. iron(III) ion, Fe³⁺
3. copper(II) ion, Cu²⁺
4. zinc ion, Zn²⁺
A sample of a salt was dissolved in hydrochloric acid. A platinum wire was dipped into the solution and then placed in a roaring bunsen flame. A bright yellow flame colour was produced. From this 'flame test' observation, what was the identity of the metal ion in the salt? [id-21]
1. sodium ion, Na⁺
2. copper(II) ion, Cu²⁺
3. potassium ion, K⁺
4. calcium ion, Ca²⁺
A sample of a salt was dissolved in hydrochloric acid. A platinum wire was dipped into the solution and then placed in a roaring bunsen flame. A blue flame colour was produced. From this 'flame test' observation, what was the identity of the metal ion in the salt? [id-22]
1. sodium ion, Na⁺
2. copper(II) ion, Cu²⁺
3. potassium ion, K⁺
4. calcium ion, Ca²⁺
A sample of a salt was dissolved in hydrochloric acid. A platinum wire was dipped into the solution and then placed in a roaring bunsen flame. A lilac/violet flame colour was produced. From this 'flame test' observation, what was the identity of the metal ion in the salt? [id-23]
1. sodium ion, Na⁺
2. copper(II) ion, Cu²⁺
3. potassium ion, K⁺
4. calcium ion, Ca²⁺
A sample of a salt was dissolved in hydrochloric acid. A platinum wire was dipped into the solution and then placed in a roaring bunsen flame. A brick red flame colour was produced. From this 'flame test' observation, what was the identity of the metal ion in the salt? [id-24]
1. sodium ion, Na⁺
2. copper(II) ion, Cu²⁺
3. potassium ion, K⁺
4. calcium ion, Ca²⁺
A white solid X dissolved in dilute hydrochloric. A colourless gas evolved which turned limewater milky. When a drop of the solution, on the end of a platinum wire, a bright yellow flame colour was observed when the platinum wire was placed in a roaring bunsen flame. From these observations deduce the identity of substance X. [id-25]
1. sodium carbonate, Na₂CO₃
2. potassium sulfite, K₂SO₃
3. calcium carbonate, CaCO₃
4. sodium sulfate, Na₂SO₄
A blue solid X was dissolved in water and the solution divided into two portions. When a few drops of sodium hydroxide was added to the 1st portion, a blue gelatinous precipitate formed. When a few drops of dilute nitric acid, followed by a few drops of barium nitrate solution was added to the 2nd portion, a white precipitate formed. From these observations deduce the identity of substance X. [id-26]
1. calcium sulfate, CaSO₄
2. copper(II) sulfate, CuSO₄
3. potassium chloride, KCl
4. copper(II) chloride, CuCl₂
Colourless crystals of substance X were dissolved in water and a few drops of dil. nitric acid, followed by a few drops of silver nitrate solution were added, and a white precipitate formed. A few crystals of X were mixed with a few drops of conc. hydrochloric acid. When a platinum wire was dipped in this mixture, and then placed in a roaring bunsen flame, a red flame colour was seen. From these observations deduce the identity of substance X. [id-27]
1. potassium sulfate, K₂SO₄
2. copper(II) chloride, CuCl₂
3. calcium chloride, CaCl₂
4. sodium sulfate, Na₂SO₄
Colourless crystals of substance X were dissolved in water and a few drops of dil. nitric acid, followed by a few drops of silver nitrate solution were added, and a yellow precipitate formed. A few crystals of X were mixed with a few drops of conc. hydrochloric acid. When a platinum wire was dipped in this mixture, and then placed in a roaring bunsen flame, a purple-lilac flame colour was seen. From these observations deduce the identity of substance X. [id-28]
1. lead(II) iodide, PbI₂
2. potassium sulfate, K₂SO₄
3. copper(II) chloride, CuCl₂
4. potassium iodide, KI
To a colourless solution X, a few drops of dil. nitric acid, followed by a few drops of silver nitrate solution were added, and a white precipitate formed. When a few drops of litmus solution were added to solution X, the solution turned red. There was no characteristic flame colour when a drop of X on the end of a platinum wire, was placed in a roaring bunsen flame. From these observations deduce the identity of solution X. [id-29]
1. hydrochloric acid, HCl
2. sulfuric acid, H₂SO₄
3. sodium hydroxide, NaOH
4. calcium hydroxide, Ca(OH)₂
To a colourless solution X, a few drops of dil. hydrochloric acid were added, followed by a few drops of barium chloride, and a white precipitate formed. When a few drops of litmus solution were added to solution X, the solution turned red. There was no characteristic flame colour when a drop of X on the end of a platinum wire, was placed in a roaring bunsen flame. From these observations deduce the identity of solution X. [id-30]
1. hydrochloric acid, HCl
2. sulfuric acid, H₂SO₄
3. sodium hydroxide, NaOH
4. calcium hydroxide, Ca(OH)₂
A colourless solution gave bright yellow flame colour when tested on the end of a platinum wire placed in a roaring bunsen flame. When a few drops of litmus solution were added to solution X, the solution turned blue. From these observations deduce the identity of solution X. [id-31]
1. hydrochloric acid, HCl
2. sulfuric acid, H₂SO₄
3. sodium hydroxide, NaOH
4. calcium hydroxide, Ca(OH)₂
A colourless solution gave a brick red colour flame when tested on the end of a platinum wire placed in a roaring bunsen flame. When a few drops of litmus solution were added to solution X, the solution turned blue. From these observations deduce the identity of solution X. [id-32]
1. hydrochloric acid, HCl
2. sulfuric acid, H₂SO₄
3. sodium hydroxide, NaOH
4. calcium hydroxide, Ca(OH)₂

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