Question

Calcium carbonate is prepared in laboratories by ______.

विकल्प

• displacement method

• decomposition method

• direct combination method

• double decomposition method

Answer 1

Calcium carbonate is prepared in laboratories by double decomposition method.

Explanation:

An insoluble salt like CaCO₃ is prepared by mixing two soluble salt solutions (e.g., CaCl₂ and Na₂CO₃), which exchange their radicals.