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The hardness of water is due to.......me...

The hardness of water is due to.......metal ions.

A

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

B

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

C

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

D

`Zn^(2+)` and `Ba^(2+)`

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