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Which of the following substances cause ...

Which of the following substances cause permanent hardness of water

A

`Na^+ and K^+`

B

`Ca^(2+) and Mg^(2+)`

C

`Ca^(2+) and K^+`

D

`Ca^(2+) and Na^(+)`

Text Solution

Verified by Experts

The correct Answer is:
B
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