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Zeolite used to soften hardness of water is, hydrated:

1. Potassium aluminium borate
2. Sodium aluminium silicate
3. Calcium aluminium borate
4. zinc aluminium borate

Correct answer: Sodium aluminium silicate

Solution

Zeolites used for softening hard water are hydrated sodium aluminosilicates. Their sodium ions exchange with calcium and magnesium ions in hard water, removing hardness.

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