Oxidation sate of $\mathrm{Cr}$ in potassium dichromate is

Oxidation sate of $\mathrm{Cr}$ in potassium dichromate is
  1. +7
  2. +6
  3. +1
  4. +5

Solution

Potassium dichromate $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ $\begin{aligned} & 1 \times 2+\mathrm{x} \times 2-2 \times 7=0^{+1} \mathrm{x}^{-2} \\ & 2 \mathrm{x}=12 \\ & \mathrm{X}=+6 \end{aligned}$

Asked in: MHT CET 2021 (21 Sep Shift 1)

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