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Question

The oxidation state of Chromium (Cr) in the complex [Cr(H2O)4Cl2]+ is :

A
+5
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B
+3
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C
+7
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D
5
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Solution

The correct option is B +3
The complex [Cr(H2O)4Cl2]+ has a overall charge +1
Let x be the oxidation state of Cr
Since H2O is a neutral molecule, it has 0 overall charge.
Charge on Cl=1
x+(4×0)+(2×(1))=+1x=+3

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