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Question

Assertion: On mixing equal volumes of 1 M $$HCl$$ and of 2 M $$CH_3COONa$$, an acidic buffer solution is formed.
Reason: The resultant mixture contains $$CH_3COOH$$ and $$CH_3COONa$$ which are parts of acidic buffer.


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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E
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 $$(CH_3COONa)$$.
Reaction:
$$CH_3COONa + HCl \rightarrow CH_3COONa + CH_3COOH$$ 
     2               1                        -                     -
    1                   -                                         1                          1
which are parts of acidic buffer

Chemistry

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