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JEE Main Chemistry question

ChemistryEquilibriumJEE Main

Kc for [Ag(CN)₂]⁻ ⇌ Ag⁺ + 2CN⁻, the equilibrium constant at 25°C is 4.0×10⁻¹⁹, then the silver ion concentration in a solution which was originally 0.1 molar in KCN and 0.03 molar in AgNO₃ is:

Answer: (B)

Solution

All Ag⁺ (0.03 M) complexes, consuming 0.06 M CN⁻, leaving free CN⁻ =

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Question ID VK-136029