MHT CET · Chemistry · d and f Block Elements
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?
- A +5 and -5
- B +5 and +5
- C -5 and +5
- D +3 and +3
Answer & Solution
Correct Answer
(B) +5 and +5
Step-by-step Solution
Detailed explanation
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 \(\mathrm{V}_2 \mathrm{O}_7^{4-}=y\)
\(\begin{aligned}
\therefore \quad 2 y+(-2 \times 7) & =-4 \\
y & =+5
\end{aligned}\)
\(\begin{aligned}
\therefore \quad x+(6 \times-1) & =-1 \\
x & =+5
\end{aligned}\)
Let oxidation number of V in \(\mathrm{V}_2 \mathrm{O}_7^{4-}=y\)
\(\begin{aligned}
\therefore \quad 2 y+(-2 \times 7) & =-4 \\
y & =+5
\end{aligned}\)
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