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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Dinesh khalmaniya 1
option A and B are correct
The buffer solution is either solution of weak acid and its salt with strong base or solution of weak base and its salt with strong acid. Thus, the solution in option A and option B form acidic and basic buffer solution respectively.
but sir in opposition c and d .. Hcl strong acid and Nh4OH weak base
one must be salt and another may be acid or base
so option C, and D doesn't form salt