1.

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.

Answer»

(i) Gas evolved : SO2 (Sulphur dioxide) 

Chemical test : It changes orange acidified potassium dichromate green. 

(ii) Gas evolved : H2S (Hydrogen sulphide) 

Chemical test : Turns lead nitrate solution black.



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