
- A$1$ only
- ✓$3$ only
- C$1$ and $2$
- D$2$ and $3$


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$[A]$ The activation energy of the reaction is unaffected by the value of the steric factor
$[B]$ Experimentally determined value of frequency factor is higher than that predicted by Arrhenius equation
$[C]$ Since $P=4.5$, the reaction will not proceed unless an effective catalyst is used
$[D]$ The value of frequency factor predicted by Arrhenius equation is higher than that determined experimentally
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.