In which of the following combinations is buf | vedclass

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(B) buffer solution is a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid.$1$. $NH_3$ (weak base) + $NH_4Cl$ (salt

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$1$ and $3$

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(B) buffer solution is a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid.$1$. $NH_3$ (weak base) + $NH_4Cl$ (salt of weak base and strong acid,providing $NH_4^+$ conjugate acid) forms a basic buffer.$2$. $HCl$ (strong acid) + $NaCl$ (salt of strong acid and strong base) does not form a buffer because $HCl$ is a strong acid.$3$. $NH_3 + HCl$ in $2:1$ mole ratio: Here,$1$ mole of $HCl$ reacts with $1$ mole of $NH_3$ to form $1$ mole of $NH_4Cl$. The remaining $1$ mole of $NH_3$ stays unreacted. Thus,we have a mixture of $NH_3$ (weak base) and $NH_4Cl$ (conjugate acid),which acts as a buffer.Therefore,combinations $1$ and $3$ exhibit buffer action.

In which of the following combinations is buffer action expected?
$1$. $NH_3 + NH_4Cl$
$2$. $HCl + NaCl$
$3$. $NH_3 + HCl$ in $2 : 1$ mole ratio
Select the correct answer using the code given below.

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Which among the following pairs constitutes a buffer?

At a constant temperature,the $pK_b$ of $NH_4OH$ is $4.74$. What is the $pH$ of a basic buffer containing equimolar concentrations of $NH_4OH$ and $NH_4Cl$?

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In which of the following combinations is buffer action expected?$1$. $NH_3 + NH_4Cl$$2$. $HCl + NaCl$$3$. $NH_3 + HCl$ in $2 : 1$ mole ratioSelect the correct answer using the code given below.