By boiling, the _______ hardness of water can be removed.

temporary

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permanent

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both temporary and permanent

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neither of them

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Solution

The correct option is B temporary
Hard water is the water that contains soluble salts of bivalent ions like calcium and magnesium principally in the form of bicarbonates, chlorides, and sulfates. Upon heating the bicarbonate salts decompose and precipitate out in the form of scaling/white deposition. Therefore Water hardness that is caused by calcium/magnesium bicarbonate is known as temporary.

Reaction involved:
$M g (H C O_{3})_{2} \to M g C O_{3} ↓ + H_{2} O + C O_{2}$

Boiling removes the temporary hardness of the water.
Option A is correct.

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Similar questions

A

B

X

X

Y

A, B, X, and Y,

Temporary and permanent hardness of water can be removed by:-

Temporary hardness of water can be removed by

(a) filtering

(b) boiling

(d) none of the above

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