Assertion: Hard water consumes more soap.
Reason: The ion responsible for cleansing action is precipitated out by $C a^{2 +}$ or $M g^{2 +}$ ion.

Assertion is correct but Reason is wrong.

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Assertion is correct but Reason is right.

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Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

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Solution

The correct option is C Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
Hard water consumes more soap because hard water contains dissolved salts of calcium, magnesium and other heavy metals and it does not form lather with soap readily, due to the reaction shown below.
$2 R C O O N a + C a^{2 +} \to (R C O O)_{2} C a + 2 N a^{+}$

Suggest Corrections

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Choose the correct option.

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Assertion: Hard water consumes more soap.Reason: The ion responsible for cleansing action is precipitated out by Ca2+ or Mg2+ ion.

Assertion: Hard water consumes more soap.
Reason: The ion responsible for cleansing action is precipitated out by $C a^{2 +}$ or $M g^{2 +}$ ion.