HomeQ&AWhen a piece of limestone reacts with dilute HCl, a gas X is produced. When gas X is passed through water, then a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z. (a) What are X, Y and Z? (b) Write equations for the reactions which takes place: (i) when limestone reacts with dilute HCl (ii) when gas X reacts with limewater to form white precipitate Y. when excess gas X dissolves white precipitate Y to form a soluble compound Z.

When a piece of limestone reacts with dilute HCl, a gas X is produced. When gas X is passed through water, then a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z. (a) What are X, Y and Z? (b) Write equations for the reactions which takes place: (i) when limestone reacts with dilute HCl (ii) when gas X reacts with limewater to form white precipitate Y. when excess gas X dissolves white precipitate Y to form a soluble compound Z.

ChemistryClass 10ICSEAnswered 27 Mar 2026

Answer

X is carbon dioxide Y is calcium carbonate Z is calcium hydrogen
(i) CaCO3 + 2HCl → CaCl2 +H2O +CO2

(ii) Ca(OH)2(aq) + CO2(g) → CaCO3 + H2O (iii)CaCO3 + CO2 + H2O → Ca(HCO3)2

Chemistry · Class 10

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