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Fixed volume of 0.1M benzoic acid soluti...

Fixed volume of 0.1M benzoic acid solution is added into 0.2 M soldium benzoate solution and formed a 300 ml, resultant acidic buffer solution. If pH of this buffer solution is 4.5 then find added volume of benzoic acid -
(Given `: pK_(a)` benzoic acid =4.2)

A

100ml

B

150 ml

C

200 ml

D

None of these

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The correct Answer is:
B
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