Assertion: On mixing equal volumes of 1 M $H C l$ and of 2 M $C H_{3} C O O N a$ , an acidic buffer solution is formed.
Reason: The resultant mixture contains $C H_{3} C O O H$ and $C H_{3} C O O N a$ which are parts of acidic buffer.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
A solution that resists change in pH value upon addition of small amount of strong acid or base (less than 1 %) or when solution is diluted is called buffer solution.
Acidic buffer solution : An acidic buffer solution consists of solution of a weak acid and its salt with strong base. The best-known example is a mixture of solution of acetic acid and its salt with strong base $(C H_{3} C O O N a)$ .
Reaction:
$C H_{3} C O O N a + H C l \to C H_{3} C O O N a + C H_{3} C O O H$
2 1 - -
1 - 1 1
which are parts of acidic buffer

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Assertion: On mixing equal volumes of 1 M HCl and of 2 M CH3COONa, an acidic buffer solution is formed.Reason: The resultant mixture contains CH3COOH and CH3COONa which are parts of acidic buffer.

Assertion: On mixing equal volumes of 1 M $H C l$ and of 2 M $C H_{3} C O O N a$ , an acidic buffer solution is formed.
Reason: The resultant mixture contains $C H_{3} C O O H$ and $C H_{3} C O O N a$ which are parts of acidic buffer.