please answer this question expertv

Solution
The correct answer is all of the above.
NH4Cl + NaOH gives NH4OH + NaCl
Upon reaction, after some time, it forms basic buffer.
Option a is correct since it is mixture of weak acid and salt of weak acid.
C6H5COONH4 forms benzoic acid and ammonium hydroxide , this reaction is an equilibrium reaction, hence buffer is formed here.
 

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