JEE Main | 2018Redox and Equivalent ConceptHard

Question

The oxidation states of
Cr in [Cr(H2O)6]Cl3,[Cr(C6H6)2] and K2[Cr(CN)2(O)2(O2)(NH3)] respectively are :

Options

A.

+3, +2, and +4

B.

+3, 0, and +6

C.

+3, 0, and +4

D.

+3, +4, and +6

Solution

(i)  [Cr(H2O)6]Cl3:Hexaaquachromium(III) chloride
x + 6 × 0 + (-1) × 3 = 0
x=+3
(ii) [Cr(C6H6)2] : bis(h6 - benzene)chromium(0)
y + 2 × 0 = 0
y=0
(iii) K2[Cr(CN)2(O)2(O2) (NH3)] :
Potassium amminedicyanidodioxidoperoxidochromate(VI)
2 × 1 + z + 2 × (-1) + 2 × (-2) + (-2) + 0 = 0
z=+6
The oxidation states of Cr in [Cr(H2O)6]Cl3, [Cr(C6H6)2], and K2[Cr(CN)2(O)2(O2) (NH3)]
respectively are +3, 0 and +6.

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