Softening of hard water is done using sodium aluminium silicate (zeolite). This causes:

adsorption of

C a^{2 +}

and

M g^{2 +}

ions of hard water replacing

N a^{\oplus}

ions

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adsorption of

C a^{2 +}

and

M g^{2 +}

ions of hard water replacing

A l^{3 +}

ions

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both A and B

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none of the above

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Solution

The correct option is B adsorption of $C a^{2 +}$ and $M g^{2 +}$ ions of hard water replacing $N a^{\oplus}$ ions
Softening of hard water is done using sodium aluminium silicate (zeolite).

This causes adsorption of $C a^{2 +}$ and $M g^{2 +}$ ions of hard water replacing $N a^{\oplus}$ ions.

For the same purpose ion exchange resins are used, in which -COOH, $- S O_{3} H$ and $- N H_{2}$ groups possess the property of selective adsorption of ions from solutions.

Option A is correct.

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Similar questions

When zeolite, which is hydrated sodium aluminimum silicate is treated with hard water, the sodium iions are exchanged with which of the following ion(s)?
(a) $H^{+}$ ions (b) $M g^{2 +}$ ions (c) $C a^{2 +}$ ions (d) $S O_{4}^{2 -}$

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