Question

Long Answer Type Questions
16. Write a balanced chemical equation and identity the type of chemical reaction taking place in each of the following:
(a) Barium chloride solution is mixed with copper sulphate solution and a white precipitate is observed.
(b) On heating copper powder in air in a china dish, the surface of copper powder turns black.
(c) On heating green coloured iron sulphate crystals, reddish-brown solid is left and smell of a gas having odour of burning sulphur is experienced.
(d) Iron nails when left dipped in blue copper sulphate solution become brownish in colour and the blue colour of copper sulphate fades away.
(e) Quicklime reacts vigorously with water releasing a large amount of heat.​

Answer 1

(a)BaCl2(l)+CuSO4(l)>BaSO4(s)+CuCl2(l)

(white percipitate)

This eq. is already balanced.

This is double displacement reaction.

(b) 2Cu(s) + O2(g) >2CuO(s)

This is combination reaction.

(c) FeSO4.7H2O+O2>FeSO4+ H2O

FeSO4 > Fe2O3 +SO2 SO3

This is decomposition reaction.

(d) CuO+H2O>Cu(OH)2 + heat

this is already balanced.

This is combination reaction.

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Answer 2

Explanation:

1st is a double displacement reaction..alon with precipitation reaction

2nd one is an oxidation reaction