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Q.

In an aqueous solution of volume 500 mL, the reaction  2Ag(aq)++Cu(s)⇌Cu(aq)2++2Ag(s)reach equilibrium with Cu2+ equal tox mollit -1 . When 500 ml of water is further added at same temperature, the new equilibrium concentration of Cu2+ will be

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a

2x mol.lit -1

b

x2 mol.lit -1

c

Between x mol.lit -1 to x2 mol.lit -1

d

Less than x2 mol.lit -1

answer is D.

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Detailed Solution

Equilibrium constant KC=Cu2+Ag+2When we dilute the solution with equal volume of water concentrations become half and reaction quotient will be more than equilibrium constant. So, reaction proceeds in backward direction.
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