NDA 2018 GAT · General Knowledge · Chemistry in Everyday Life · easy

The chemical formula of washing soda is

Single correct option

A. Na2CO3·10H2O
B. NaHCO3
C. Na2CO3
D. CaOCl2

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Answer: (A) Na2CO3·10H2O

Washing soda is sodium carbonate decahydrate, Na2CO3·10H2O, obtained by recrystallising sodium carbonate. NaHCO3 is baking soda, anhydrous Na2CO3 is soda ash, and CaOCl2 is bleaching powder. Students often confuse washing soda with baking soda.

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Original question written in the NDA 2018 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake