JEE Advance - Chemistry (2010 - Paper 1 Offline - No. 4)

Aqueous solution of HNO3, KOH and CH3COOH and CH3COONa of identical concentrations are provided. The pairs of solutions which form a buffer upon mixing is(are)
HNO3 and CH3COOH
KOH and CH3COONa
HNO3 and CH3COONa
CH3COOH and CH3COONa

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