In the complex $[C o {(N H_{3})}_{6}] [C d C l_{x}]$ , if the oxidation number of cobalt is +3, then the value of x is:

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Solution

The correct option is D 5
In the given complex, $[C o (N H_{3})_{6}] [C d C l_{x}]$ , Co has +3 charge. So, the complex $[C o (N H_{3})_{6}]$ has +3 charge. Accordingly, $[C d C l_{x}]$ has -3 charge. The charge on Cd is +2 (only possible value). So, the value of x should be 5 for complete balancing.

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