
State symbols like (aq), (g), (l) and (s) have been left out so
you can concentrate on deducing the balancing numbers from 2, 3, 4 etc.
Some are very easy but some are much more tricky and the last one is ghastly!
(1)
HCl + CuO ===> CuCl
2 + H
2O
(2) CaCO
3 +
HCl ===> CaCl
2 + H
2O + CO
2(3) Cu(OH)
2 + H
2SO
4 ===> CuSO
4 +
H
2O
(4) Fe
3O
4 +
C ===>
Fe +
CO
2(5)
NaHCO
3 ===> Na
2CO
3 + H
2O + CO
2(6) H
3PO
4 +
KOH ===> K
3PO
4 +
H
2O
(7)
CuO + C ===>
Cu + CO
2(8)
Al(OH)
3 +
H
2SO
4 ===> Al
2(SO
4)
3 +
H
2O
(9) Fe
2O
3 +
CO ===>
Fe +
CO
2(10) Fe
3O
4 +
C ===>
Fe +
CO

(11) This last one is real brain teaser - normally encountered at A level, but be brave, and have a go, after all, the first number is given and nobody is looking!
2KMnO
4 +
HCl ===>
KCl +
MnCl
2 +
Cl
2 +
H
2O