Sodium carbonate or washing soda or soda ash is:

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Sodium salt of sulphuric acid

Sodium salt of carbonic acid

Ammonium salt of carbonic acid

Potassium salt of carbonic acid

answer is B.

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Detailed Solution

Concept- Sodium carbonate is chemically written as

{Na}_{2} C O_{3}

. It can be categorised as an inorganic compound. All sodium carbonate hydrates are referred to as soda ash.
Now, sodium carbonate is prepared from carbonic acid which is a weak acid and sodium hydroxide which is a strong base.
The molecular formula for carbonic acid is

and the molecular formula for sodium hydroxide is NaOH.
The carbonic acid and sodium hydroxide reacts as-

The product formed is sodium carbonate. The molecular formula for sodium carbonate is

.
Thus, sodium carbonate is sodium salt of carbonic acid.
Hence, the correct option is (2).

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