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MHT CET Chemistry question

ChemistryEquilibriumMHT CET

for HCN is at 25 C. For maintaining a constant pH = 9, the volume of 5 M KCN solution required to be added to 10 mL of 2 M HCN solution is

Answer: (A)

Solution

At pH 9, so ; HCN = 20

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Question ID VK-059092