Q.

Washing soda is the common name of-

A. Calcium Carbonate
B. Calcium Bi-Carbonate
C. Sodium Carbonate
D. Sodium Bi-Carbonate
Answer» C. Sodium Carbonate
Explanation: Washing soda, sodium carbonate decahydrate, efflorescent crystals used for washing, especially textiles. It is a compound of sodium (q.v.).
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