MCQ
The solid phosphorous pentachloride exists
- A$PCl_5$
- B$PCl_4 ^+ \,Cl^-$
- C$PCl_6^-$
- ✓$PCl_4^+\, PCl_6^-$
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Statement $I : CeO _{2}$ can be used for oxidation of aldehydes and ketones.
Statement $II :$ Aqueous solution of $EuSO _{4}$ is a strong reducing agent.
In the light of the above statements, choose the correct answer from the options given below

$O(g) + e^- = O^-(g)$ $\Delta {H_{eg}} = - 142\,kJ\,mo{l^{ - 1}}$
$O^-(g) + e^- = O^{2-}(g)$ $\Delta {H_{eg}} = +844\,kJ\,mo{l^{ - 1}}$
This is because