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Question

Aqueous solutions of HNO3,KOH,CH3COOH and CH3COONa of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are):
  1. HNO3 and CH3COOH
  2. KOH and CH3COONa
  3. HNO3 and CH3COONa
  4. CH3COOH and CH3COONa

A
HNO3 and CH3COOH
B
KOH and CH3COONa
C
HNO3 and CH3COONa
D
CH3COOH and CH3COONa
Solution
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Buffer solutions mean which can resist a change of pHAcidic Buffer(Acid + salt)Basic Buffer (Base+salt),
HNO3+CH3COONaCH3COOH+CH3COONaHNO3weak acidCH3COOHweak acid

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