Q23 / 150 · MHT CET 2020 (14 Oct Shift 1) · Chemistry

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

  • Correct answer
    A
    +3
  • B
    +2
  • C
    +6
  • D
    +5

Solution

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

Hence, the correct answer is option: 'A'.

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