The co-ordination number of Cr in a complex $[C r (N H_{3})_{6}] C l_{3}$ is:

3

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6

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2

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4

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Solution

The correct option is A $6$
As 6 ligands of $N H_{3}$ are attached to to the Cr in given complex, the co-ordination number of Cr will be $6$

Hence, the correct option is $B$

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