Question

Permanent hardness in water is due to the presence of:

A

B

C

D

all of the above

Medium
Solution
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Correct option is B)

Correct Answer: Option B

Explanation: 
The permanent hardness of water is due to sulfates and chlorides of Magnesium () and Calcium (). The bicarbonates of Magnesium () and Calcium () cause temporary hardness.

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