JEE Main 2020 · 2 September · morning · Single correct · +4 / −1

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) + S 2– (aq) ⇌ CuS(s) is high because the solubility product is low.

1. (a) (A) is false and (R) is true.
2. (b) Both (A) and (R) are true but (R) is not the explanation for (A).
3. (c) Both (A) and (R) are true and (R) is the explanation for (A).
4. (d) Both (A) and (R) are false.