What is the oxidation number of underlined species in $\underline{\mathrm{P}}\mathrm{F}_6^{-}$ and…

What is the oxidation number of underlined species in $\underline{\mathrm{P}}\mathrm{F}_6^{-}$ and $\underline{\mathrm{V}}_2 \mathrm{O}_7^{-4}$ ions respectively?
  1. +5 and -5
  2. +5 and +5
  3. -5 and +5
  4. +3 and +3

Solution

Let oxidation number of $\mathrm{P}_{\text {in }} \mathrm{PF}_6^{-}=x$ $\begin{aligned} \therefore \quad x+(6 \times-1) & =-1 \\ x & =+5 \end{aligned}$
Let oxidation number of V in $\mathrm{V}_2 \mathrm{O}_7^{4-}=y$ $\begin{aligned} \therefore \quad 2 y+(-2 \times 7) & =-4 \\ y & =+5 \end{aligned}$

Asked in: MHT CET 2024 (02 May Shift 1)

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