Question

28. When a colourless gas 'A' is passed through slaked lime, a white substance 'B' is
formed, 'B' is a water insoluble substance used as a building material, when 'B' is
reacted with dilute HCl it again produces gas 'A'.
a) Predict the gas 'A' and the substance 'B'.
b) Write the balanced chemical equation for all the reactions involved
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Answer 1

Answer:

B) is right answer

if that answer is right follow me

Answer 2

Answer:

CO2 is the gas 'A' and building material 'B' is CaCO3.

Explanation:

The colorless gas "CO2" when passed through slaked lime i.e. Ca(OH)2 gives a white substance called calcium carbonate. This CaCO3 as stated is used as a building material. When this reacts with HCl again gives back the colorless CO2 gas in the form of vapors because of the reaction involved. ( Mentioned below)

a) CO2 is the colorless gas 'A' and Building material 'B' is calcium carbonate.

b) Reactions involved in the following are :

    Ca(OH)2 (aq) + CO2 (g) ----------> CaCO3(s) + H2O (l)

    CaCO3 (s) + HCl (aq) ------------> CaCl2(aq) + H2O (l) + CO2 (g)

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