Question

c) Name the gas evolved in each of the following cases
1) Copper carbonate is heated strongly
ii) Nitrogen combines with hydrogen
iii) Action of dilute hydrochloric acid on sodium sulphite​

Answer 1

Answer:

a) carbon dioxide (CO2)

b)ammonia (NH3)

c) carbon dioxide (CO2)

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Answer 2

Answer:

(i) When green copper carbonate{CuCO3} is heated it decomposes forming copper oxide {CuO} and carbon dioxide {CO2}.

So the gas evolved is carbon dioxide {CO2}.

(ii) The gas evolved is ammonia(NH3).

When hydrogen gas combines with nitrogen to form Ammonia.

N2(g) + 3H2(g) ⇔ 2NH3(g) + Heat.

(iii) When dilute hydrochloric acid reacts with sodium sulphite, sulphur dioxide gas is evolved.

Na2SO3+ 2HCl (dil.)----> 2NaCl + H2O +SO2

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