Assertion :Zeolite, which is hydrated sodium aluminium silicate is used as a water softner. Reason: The sodium ions of zeolite are exchanged with calcium and magnesium ions when hard water is passed through it.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Zeolite, which is hydrated sodium aluminium silicate is used as a water softner. The sodium ions of zeolite are exchanged with calcium and magnesium ions when hard water is passed through it. This makes water soft. The following reaction takes place:
$N a_{2} A l_{2} S i_{2} O_{8} . x H_{2} O + C a^{2 +} \to C a A l_{2} S i_{2} O_{6} . x H_{2} O + 2 N a^{+}$
$N a_{2} A l_{2} S i_{2} O_{8} . x H_{2} O + M g^{2 +} \to M g A l_{2} S i_{2} O_{8} . x H_{2} O + 2 N a^{+}$

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