Chemistry - Coordination Chemistry Question with Solution | TestHub

Statement (A) is correct: $Q$ represents half the Bond Energy ($\frac{1}{2}\Delta H_{BE}$) of Cl₂. Since the total value is $-228$, and $\Delta H_{eg}$ is $-349$, then $Q-349=-228$, which gives $Q=121kJ/mole$.

Statement (B) is incorrect: $112kJ/mole$ is half the bond energy ($\frac{1}{2}\Delta H_{BE}$) for Bromine; therefore, the total B.E. of Br₂ is $224kJ/mole$.

Statement (C) is correct: Anionic radius increases down the group (Cl⁻ < Br⁻ < I⁻); since Cl⁻ is $181pm$, Br⁻ (P) must be higher.

Statement (D) is correct: Atomic radii are always smaller than their corresponding anionic radii due to less electron-electron repulsion.