Sodium carbonate is a basic salt because it is a salt of(a) strong acid and strong base(b) weak acid and weak base(c) weak base and strong acid(d) strong base and weak acid

Sodium carbonate is a basic salt because it is a salt of a strong base and a weak acid. So, the correct answer is (d) strong base and weak acid.

Here's why:

Sodium carbonate (Na2CO3) is formed from the reaction of sodium hydroxide (NaOH), a strong base, and carbonic acid (H2CO3), a weak acid. In water, sodium carbonate will dissociate into sodium ions (Na+) and carbonate ions (CO3^2-). The carbonate ions can react with water to form bicarbonate ions (HCO3-) and hydroxide ions (OH-). The presence of these hydroxide ions (OH-) makes the solution basic.

Therefore, sodium carbonate is considered a basic salt because it is derived from a strong base and a weak acid.