Which of the following salt is known as washing soda?

CHEMISTRY · Single correct · CBSE · Chemistry · Acids, Bases and Salts · Acids, Bases and Salts

Problem

Which of the following salt is known as washing soda? (1)

\text{Na}_2\text{CO}_3

(2)

\text{Na}_2\text{CO}_3 \cdot \text{H}_2\text{O}

(3)

\text{Na}_2\text{CO}_3 \cdot 10\text{H}_2\text{O}

(4)

\text{Na}_2\text{CO}_3 \cdot 5\text{H}_2\text{O}