Verified Solution • 2025–26 Session
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QJEEM20Chc0a0: JEE Main 2020 Chemistry - Class 11 JEEM20Chc0a0 Solution: For the following Assertion and Reason , the correct option is…
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.
Multiple Choice Options
- A (A) is false and (R) is true.
- B Both (A) and (R) are true but (R) is not the explanation for (A).
- C Both (A) and (R) are true and (R) is the explanation for (A).
- D Both (A) and (R) are false.
Step-by-Step Verified Solution
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.