Assertion: A mixture of $C H_{3} C O O H$ and $C H_{3} C O O N H_{4}$ is not a buffer solution.
Reason: An acidic buffer contains the mixture of a weak acid and its salt with a strong base.

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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Assertion is correct but Reason is not correct

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Assertion is not correct but Reason is correct

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Both Assertion and Reason are not correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation of Assertion
Acidic buffer solution is prepared by mixing a weak acid and its salt with strong base. A solution containing weak acid and its salt with weak base is not a buffer solution.
Ammonium acetate is a salt of weak acid and weak base. Hence, mixture of acetic acid and ammonium acetate is not a buffer solution.

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Similar questions

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Reason (R) - OH group in phenol is o-,p-directing.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
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and

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Assertion (A) Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid.
Reason (R) Lewis acid polarises the bromine molecule.
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Assertion: A mixture of CH3COOH and CH3COONH4 is not a buffer solution.Reason: An acidic buffer contains the mixture of a weak acid and its salt with a strong base.

Assertion: A mixture of $C H_{3} C O O H$ and $C H_{3} C O O N H_{4}$ is not a buffer solution.
Reason: An acidic buffer contains the mixture of a weak acid and its salt with a strong base.