Out of the following,which pair of solutions | vedclass

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(B) buffer solution is typically formed by a weak acid and its conjugate base,or a weak base and its conjugate acid.$NH_4Cl + NH_4OH$ is a mixture of

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$NaCl + NaOH$

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(B) buffer solution is typically formed by a weak acid and its conjugate base,or a weak base and its conjugate acid.$NH_4Cl + NH_4OH$ is a mixture of a weak base $(NH_4OH)$ and its conjugate acid $(NH_4^+)$.$Na_2HPO_4 + Na_3PO_4$ is a mixture of a weak acid $(HPO_4^{2-})$ and its conjugate base $(PO_4^{3-})$.$CH_3COOH + CH_3COONa$ is a mixture of a weak acid $(CH_3COOH)$ and its conjugate base $(CH_3COO^-)$.$NaCl + NaOH$ consists of a salt of a strong acid and strong base $(NaCl)$ and a strong base $(NaOH)$. Since $NaCl$ is not a weak acid or base,this mixture does not act as a buffer solution.

Out of the following,which pair of solutions is not a buffer solution?

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