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Auto Protolysis of Water

Assertion :Th...

Question

Assertion :The micelle formed by sodium stearate in water has $- C O O^{-}$ groups at the surface. Reason: Surface tension of water is reduced by addition of stearate.

Choose the correct option.

A

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

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B

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

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C

Assertion is correct but Reason is incorrect

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D

Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The decrease in surface tension is not responsible for the presence of the carboxylate group at the surface. The presence of $C O O^{-}$ at the surface is due to the micelle formation.

Hence, both assertion and reason are correct but the reason is not the correct explanation of assertion

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Reason (R) Addition of water in acidic medium proceeds through the formation of primary carbocation.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Q. Assertion :The micelle formed by sodium stearate in water has

- {C O O}^{-}

groups at the surface. Reason: Surface tension of water is reduced by the addition of stearate.

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