Question

Give balanced equation for reaction involving evolution of a gas on addition of dilute acid to
A. Sodium sulphite
B. Calcium carbonate

Answer 1

A. Na2SO3 + (dil.)HCl ----> NaCl + H2O + SO2(g)
B. CaCO3 + (dil.)HCl ----> CaCl2 + H2O + CO2(g)
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Answer 2

Explanation:

Na2SO3 + 2HCL ---> NaCl + H2O + SO2

CaCO3 + 2HCl ----> CaCl2 + 2H2O + CO2