Calculate oxidation number in $N a_{3} [C o (N O_{2})_{6}]$ .

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Solution

The correct option is B 3
oxidation number in $N a_{3} [C o (N O_{2})_{6}]$ is $+ 3$
$3 (+ 1) + X + 6 (- 1) = 0$
$X = 6 - 3 = + 3$ .
So the oxidation numberof $C o$ in $N a_{3} [C o (N O_{2})_{6}]$ is $+ 3$ .

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