In which of the following combinations is buf | vedclass

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(B) buffer solution is formed by a weak acid and its salt with a strong base,or a weak base and its salt with a strong acid.$(a)$ $NH_4OH$ (weak base)

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$a$ and $c$

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(B) buffer solution is formed by a weak acid and its salt with a strong base,or a weak base and its salt with a strong acid.$(a)$ $NH_4OH$ (weak base) and $NH_4Cl$ (salt of weak base and strong acid) form a basic buffer.$(b)$ $HCl$ (strong acid) and $NaCl$ (salt of strong acid and strong base) do not form a buffer.$(c)$ $NH_4OH + HCl$ in $2:1$ mole ratio:$NH_4OH + HCl ightarrow NH_4Cl + H_2O$Initial: $2 	ext{ mol}, 1 	ext{ mol}, 0, 0$After reaction: $1 	ext{ mol}, 0, 1 	ext{ mol}, 1 	ext{ mol}$The resulting mixture contains $1 	ext{ mol}$ of $NH_4OH$ (weak base) and $1 	ext{ mol}$ of $NH_4Cl$ (salt),which acts as a basic buffer.Therefore,both $(a)$ and $(c)$ exhibit buffer action.

In which of the following combinations is buffer action expected?
$(a)$ $NH_4OH + NH_4Cl$
$(b)$ $HCl + NaCl$
$(c)$ $NH_4OH + HCl$ in $2:1$ mole ratio
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In which of the following combinations is buffer action expected?$(a)$ $NH_4OH + NH_4Cl$$(b)$ $HCl + NaCl$$(c)$ $NH_4OH + HCl$ in $2:1$ mole ratioSelect the correct answer using the code given below.