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MHT CET202415 May 2024Morning ShiftChemistryd and f Block ElementsActual

Calculate the oxidation number of Cr in CrO ₄²⁻ ion and K ₂ Cr ₂ O ₇ respectively.

Options

  1. A+4 and +6
  2. B+3 and +2
  3. C+6 and +6
  4. D+8 and +2

Correct answer

C. +6 and +6

Step-by-step solution

Let x be the oxidation number of Cr in CrO ₄²⁻ array ll & x+4 (-2)=-2 & x-8=-2 & x=8-2=+6 array Let y be the oxidation number of Cr in K ₂ Cr ₂ O ₇ array ll & 2 (+1)+2(y)+7 (-2)=0 & +2+2 y-14=0 & 2 y=12 & y=+6 array

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