The buffer capacity is maximum when:
one mole of NH4Cl is added to two moles of NH4OH
one mole of NH4Cl is added to one moles of NH4OH
one mole of NH4Cl is added to one moles of NaOH
one mole of Nafor base buffer under above conditionCl is added to one moles of NaOH
Buffer capacity is maximum when [salt] = [base].
i.e., pOH = pKb for base buffer under above condition,the buffer is called efficient.
Therefore,option(2) is correct.
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