Question

A substance X is used as a building material and insoluble in hydroxide. when reacts with dilute HCL, it produces a gas which turns lime water milky, product the substance and write the chemical equation involved​

Answer 1

Answer:

The substance is probably calcium carbonate (CaCO3). also called lime stone or marble. It is used as a building material. On reacting with dilute HCl, it evolves CO2 gas which turns lime water milky.

CaCO3 + HCl ──⟩ CaCl2 + H2O + CO2 ↑

Answer 2

The substance is (CaCO)3 and the CO2 gas is involved in changing the state and the chemical eqn is
CaCO3+HCL——>CaCl2+H2O+Co2