Which of the following is a buffer solution?

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(D) buffer solution is formed when a weak acid reacts with a limited amount of a strong base,or a weak base reacts with a limited amount of a strong a

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All of these

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(D) buffer solution is formed when a weak acid reacts with a limited amount of a strong base,or a weak base reacts with a limited amount of a strong acid,resulting in a mixture of the weak electrolyte and its conjugate salt.$(A)$ $100 \ mL, 0.1 \ M \ CH_3COOH$ $(10 \ mmol)$ + $100 \ mL, 0.05 \ M \ NaOH$ $(5 \ mmol)$: This results in $5 \ mmol$ of $CH_3COOH$ and $5 \ mmol$ of $CH_3COONa$,forming an acidic buffer.$(B)$ $200 \ mL, 0.1 \ M \ NH_4OH$ $(20 \ mmol)$ + $200 \ mL, 0.08 \ M \ HCl$ $(16 \ mmol)$: This results in $4 \ mmol$ of $NH_4OH$ and $16 \ mmol$ of $NH_4Cl$,forming a basic buffer.$(C)$ $300 \ mL, 0.1 \ M \ NaOH$ $(30 \ mmol)$ + $500 \ mL, 0.1 \ M \ C_6H_5COOH$ $(50 \ mmol)$: This results in $20 \ mmol$ of $C_6H_5COOH$ and $30 \ mmol$ of $C_6H_5COONa$,forming an acidic buffer.Since all options result in a mixture of a weak acid/base and its salt,all are buffer solutions.

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