Amongst the following, identify the species with an atom in + 6 oxidation state.

Amongst the following, identify the species with an atom in +6 oxidation state.
  1. CrO 2 Cl 2
  2. Cr CN 6 3 -
  3. Cr 2 O 3
  4. MnO 4 -

Solution

Cr + 6 O - 2 2 Cl - 1 2

⇒x+2(−2)+2(−1)=0x=6

Cr + 3 CN 6 - 3

⇒x+6(−1)=−3x=3

Cr + 3 2 O - 2 3

⇒2x+3(−2)=0x=3

Mn + 7 O 4 - 2 - 1

⇒x+4(−2)=−1x=+7
 

Asked in: JEE Main 2014 (19 Apr Online)

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