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Which mixture(s) form(s) buffer solutions?
(P) $100 mL$ of $0.200 M HF + 200 mL$ of $0.200 M NaF$
(Q) $200 mL$ of $0.200 M HCl + 200 mL$ of $0.400 M {CH}_{3} {CO}_{2} Na$
(R) $300 mL$ of $0.100 M$ ${CH}_{3} {CO}_{2} H + 100 mL$ of $0.300 M {CH}_{3} {CO}_{2} Na$

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P only

R only

Q and R only

P, Q and R

answer is D.

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Detailed Solution

A mixture of $WA +$ salt (of its $WA + SB$ ) forms a buffer.

$\begin{array}{l} \Rightarrow (Q) \\ \underset{40}{HCl} + \underset{80}{{CH}_{3} {COO}^{-}} ⟶ {CH}_{3} COOH + {Cl}^{-} \end{array}$

_ 40 40

Here, all the three gives the buffer solution.

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