Question

Common name for \( \text{Na}_2\text{CO}_3 \) is:

• A. Bleaching powder
• B. Baking powder
• C. Washing soda
• D. Plaster of Paris

Hint:

Sodium carbonate \( \text{Na}_2\text{CO}_3 \) is commonly known as washing soda and is used in laundry to soften water.

Answer 1

The Correct Option is C

Sodium carbonate \( \text{Na}_2\text{CO}_3 \) is commonly known as washing soda. It is used in cleaning and washing processes because it can soften water.

Step 1: Bleaching powder.
Bleaching powder is \( \text{Ca(OCl)}_2 \), which is used for bleaching purposes and is not related to \( \text{Na}_2\text{CO}_3 \).

Step 2: Baking powder.
Baking powder is a mixture of sodium bicarbonate \( \text{NaHCO}_3 \) and an acid. It is not the same as washing soda.

Step 3: Plaster of Paris.
Plaster of Paris is \( \text{CaSO}_4 \cdot \frac{1}{2} \text{H}_2\text{O} \), and it is used for making molds, not for cleaning purposes like washing soda.

Step 4: Conclusion.
Therefore, the correct answer is (C) Washing soda.