JEE MAIN - Chemistry (2020 - 2nd September Morning Slot - No. 10)
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 solid.
Reason (R): The equilibrium constant of
Cu2+(aq) + S2–(aq) ⇌ CuS(s) is high because the solubility product is low.
Assertion (A): When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid.
Reason (R): The equilibrium constant of
Cu2+(aq) + S2–(aq) ⇌ CuS(s) is high because the solubility product is low.
(A) is false and (R) is true.
Both (A) and (R) are true but (R) is not the
explanation for (A).
Both (A) and (R) are true and (R) is the
explanation for (A).
Both (A) and (R) are false.
Explanation
Ksp value of CuS is very low 10–36 (3.6 × 10–36)
due to low Ksp value Cu+2 ion gets precipitated
very quickly even with very low concentration
of S–2 ion.
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