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JEE Main Chemistry question

ChemistryEquilibriumJEE Main

In an aqueous solution of volume 500 mL, when the reaction 2Ag⁺ + Cu ⇌ Cu²⁺ + 2Ag reaches equilibrium the [Cu²⁺] was x M. When 500 mL of water is further added, at the equilibrium [Cu²⁺] will be:

Answer: (D)

Solution

Kc=[Cu²⁺]/[Ag⁺]². On simple dilution Q becomes 2Kc (>Kc), so

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Question ID VK-136016