Sunday, 10 November 2013

What is the cause of permanent hardness in water ?

RRB ALLAHABAD ASM EXAM
Model solved paper held on 26-03-2006

What is the cause of permanent hardness in water ?

1) Sodium bicarbonate

2) Calcium carbonate

3) Magnesium bicarbonate

4) Calcium sulphate

Answer :

4) Calcium sulphate

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