A) Chlorine
B) Washing soda
C) Potassium permanganate
D) Bleaching powder
Correct Answer: B
Solution :
Washing soda also known as sodium carbonate (\[N{{A}_{2}}C{{O}_{3}}\]) can remove permanent hardness of water. Calcium and magnesium ions present in hard water react with sodium carbonate to produce insoluble carbonates. The water now contains soluble and harmless sodium salts.You need to login to perform this action.
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