Question

answer the question in attachment​

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

Answer:

Calcium carbonate (CaCO3).

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 ↑