Question

Insoluble salts can be prepared by reaction between ______.

Options

• Acid and a metal carbonate

• Acidic oxide and basic oxide

• Acid and an active metal

• Acid and a metal carbonate and acidic oxide and basic oxide

Answer 1

Insoluble salts can be prepared by reaction between acidic oxide and basic oxide.

Explanation:

When a basic oxide (like CaO) directly combines with an acidic oxide (like SiO₂), they undergo a direct synthesis reaction to produce an insoluble salt (like calcium silicate, CaSiO₃).