Identify the oxidation state of $\mathrm{Cr}$ in $\mathrm{K}_{3}\left[\mathrm{Cr}\left(\mathrm{C}_{2}…

Identify the oxidation state of $\mathrm{Cr}$ in $\mathrm{K}_{3}\left[\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$
  1. +3
  2. +2
  3. +6
  4. +5

Solution

Oxalate $\rightarrow \mathrm{C}_{2} \mathrm{O}_{4}^{2-}$ $\mathrm{K}_{3}\left[\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right] \rightarrow(1 \times 3)+\mathrm{Cr}+(-2 \times 3)=0$ $\quad 3+\mathrm{Cr}-6=0$ $\therefore \mathrm{Cr}=+3$

Asked in: MHT CET 2020 (14 Oct Shift 1)

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