66. Which one of the following will not give buffer solution 1) NaCN (0.1 mole) + HC1 (0.04 mole) 2) H₂CO3 (0.1 mol) + Na₂CO3 (0.05 mole) 3) CH3COOH + CH3COONa 4) NH4Cl (1 mole) + NaOH (2 moles)
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answer is 3
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