1.

Which of the following pair of ions makes the water hard

Answer»

`NA^(+), SO_4^(2-)`
`K^(+) , HCO_3^-`
`CA^(2+) , NO_3^(-)`
`NH_4^(+), Cl^(-)`

Solution :`HCO_3^-` is main REASON of temporary hardness of WATER.


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