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Which ion is responsible for the hardnes...

Which ion is responsible for the hardness in water?

A

`CA^(+2)`

B

`Na^(+)`

C

`CI^(-)`

D

K

Text Solution

Verified by Experts

The correct Answer is:
A
The ions that cause hardness in water are `Ca^(+2) and Mg^(+2)`. They form salts with `HCO_3, CI^(-), SO_4^(-2)` ions which when dissolved in water, cause the hardness of the water.
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