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Question

Aqueous solution of HNO3,KOH,CH3COOH and CH3COONa of identical concentration are provided. The pair(s) of solution which forms buffer upon mixing is (are)
  1. KOH and CH3COONa 
  2. HNO3 and CH3COOH
  3. HNO3  and CH3COONa
  4. CH3COOH and CH3COONa


Solution

The correct option is D CH3COOH and CH3COONa
A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base or weak base and its conjugate acid. 

Of all options, only in option "D", there is a pair of a weak acid and salt of its conjugate base.  

Hence, Option "D" is the correct answer. 

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