Question

Which method is useful to remove temporary hardness? (A) Heating the water and then cooling (B) Resin method (C) Ion exchange method (D) None from the given

Answer 1

Dear Friend,
Kindly mark the answer as brainliest if you find it useful.

Here's what you were looking for:

The correct answer is all of these.
As,

For temporary hardness:
Heating the water and then cooling

For permanent hardness:
Resin Method
Ion exchange Method

The methods used for removing permanent hardness can also be used to remove temporary hardness of water.
Therefore the answer is all of these(for Multiple choice Question).

But for a single answer correct the most appropriate answer is (A).


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Answer 2

Answer is option (A) Heating the water and then cooling. Hard water contains dissolved magnesium and calcium ions.

These make it more difficult for the water to form a lather with soapfor  cleaning purposes of cloths and dresses. 

Temporary hardness is caused by dissolved calcium hydrogencarbonate which is eliminated by boiling.

Permanenthardness is caused by dissolved calcium sulphate which is not be eliminated  by boilingand therefore   needs special methods.