Q.

For the following Assertion and Reason, the correct option is Assertion (A): When Cu(II) and sulphide ions are mixed, they react together extremely quickly to give a solidReason (R): The equilibrium constant of Cu2+aq+S2−aq→  CuSs is high because the solubility product is low.

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a

Both A and R are true but R is not the explanation for A

b

Both A and R are true and R is the explanation for A

c

A is false and R is true.

d

Both A and R are false.

answer is A.

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Detailed Solution

Precipitation reactions involving ions are very fast. The equilibrium constant for the formation of CuS is high as it is precipitated in acidic medium. Both A and R are correct. But higher equilibrium constant doesn’t mean higher rate.
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For the following Assertion and Reason, the correct option is Assertion (A): When Cu(II) and sulphide ions are mixed, they react together extremely quickly to give a solidReason (R): The equilibrium constant of Cu2+aq+S2−aq→  CuSs is high because the solubility product is low.