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Fixed volume of 0.1 M benzoic acid (pK(a...

Fixed volume of 0.1 M benzoic acid `(pK_(a)=4.2)` solution is added into 0.2 M sodium 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 :

A

100 mL

B

150 mL

C

200 mL

D

None of these

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