Assertion :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: Acid buffer contains the mixture of weak acid and its salt with strong base.

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 D Assertion is incorrect but Reason is correct
A buffer solution is one which resists changes in pH when small quantities of an acid or an alkali are added to it.

Mixture of $C H_{3} C O O H$ and $C H_{3} C O O N H_{4}$ is not a buffer solution. So Assertion is incorrect.
An acidic buffer solution is simply one which has a pH less than 7. Acidic buffer solutions are commonly made from a weak acid and one of its salts - often a sodium salt.EX: $C H_{3} C O O H + C H_{3} C O O N a$ .
Assertion is incorrect but Reason is correct.
Hence option D is correct.

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Assertion :Mixture of CH3COOH and CH3COONH4 is not a buffer solution. Reason: Acid buffer contains the mixture of weak acid and its salt with strong base.

Assertion :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: Acid buffer contains the mixture of weak acid and its salt with strong base.