MCQ
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 $Cu ^{2+}( aq )+ S ^{2-}( aq ) \rightleftharpoons \operatorname{CuS}( s )$ is high because the solubility product is low.
- ABoth $( A )$ and $( R )$ are true and $( R )$ is the explanation for $(A)$
- BBoth $(A)$ and $(R)$ are false
- C$(A)$ is false and $( R )$ is true
- ✓Both $( A )$ and $( R )$ are true but $( R )$ is not the explanation for $(A)$