Question

When dilute hydrochloric acid is added to sodium compound a then brisk effervescence of gas b is produced .On passing this gas through limewater the lime water turns milky forming an insouluble compound c when excess of gas is passed the insoluble compound dissolves forming a soluble compound d what could be compound d

Answer 1

b) Brisk effervescence of carbon dioxide gas

c) caCo2

Answer 2

Hello dear,


● Answer -
Compound D is calcium bicarbonate Ca(HCO3)2

● Explanation -
Supposed sodium compound A is sodium carbonate.

Sodium carbonate (A) reacts with HCl to form sodium chloride with effervescence of CO2 gas (B).
Na2CO3 + 2HCl --> 2NaCl + CO2 + H2O

CO2 gas (B) when passed through lime water turns it milky due to formation of calcium carbonate (C).
Ca(OH)2 + CO2 --> CaCO3 + H2O

When excess CO2 (B) is passed through aquoeus soln of CaCO3, it changes to CaHCO3 (D) which is water soluble.
CaCO3 + H2O + CO2 --> Ca(HCO3)2


Thanks for asking...