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Q.

What is the change in oxidation state of cobalt in the following reaction?

[Co(NH3)4Cl2]+ + H2O →[Co(NH3)4(H2O)Cl]2+ + Cl-

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a

No change in oxidation number

b

Increases from +1 to +2

c

Increases from +2 to +3

d

Decreases from +3 to +2

answer is D.

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Detailed Solution

Oxidation number of Co in [Co(NH3)4Cl2]+ ion = +3

Oxidation number of Co in [Co(NH3)4(H2O)Cl]2+ = +3

No change in oxidation number

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