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Q.

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

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a

adsorption of Ca2+ and Mg2+ ions of hard water replacing Na+ ions.

b

adsorption of Ca2+ and Mg2+ ions of hard water replacing Al3+ ions.

c

both (1) and (2)

d

none of these

answer is A.

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Detailed Solution

Softening of hard water : Ion exchange resins used for softening of hard water is based upon selective and competive adsorption of ions on resins.Na2Z+Ca+2⟶CaZ+2Na+The organic polymers containing groups like -COOH, -SO3H and -NH2 etc. possess the property of selective adsorption of ions from solution. These are quite useful in the softening of water.
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