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Question

Oxidation number of cobalt in [Co(NH3)6]Cl2Br is -

A
6
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B
zero
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C
3
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D
2
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Solution

The correct option is C 3
Let the O.N. of Co be x
Where O.N. represnts the oxidation number.

here also,
O. N. of NH3 is zero
O. N. of Cl is - 1
O. N. of Br is -1

O.N. of (Co)+6×O.N. of (NH3)+2×O.N. of (Cl)+O.N. of (Br)=0

putting the values,
x+6(0)1×21=0
x=+3
So, the oxidation number of cobalt in the given complex compount is +3.

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