Identify the gas evolved and give the chemical test in each of the following cases:

ICSE Class 10 Chemistry PYQ · 2016 Paper · Section II

4(a)Written · 2016 · Section II · 2016 Paper

Identify the gas evolved and give the chemical test in each of the following cases:

(i) Dilute hydrochloric acid reacts with sodium sulphite.

(ii) Dilute hydrochloric acid reacts with iron (II) sulphide.

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(i) SO2 is evolved when dilute hydrochloric acid reacts with sodium sulphite.

Na2SO3 + 2HCl ⟶ 2NaCl + H2O + SO2 [g]

(ii) H2S gas is evolved when dilute hydrochloric acid reacts with Iron [II] sulphide.

FeS + 2HCl ⟶ FeCl2 + H2S

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