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# Specify the oxidation numbers of the metals in the following coordination entities: (i) [Co(H_{2}O)(CN)(en)_{2}]^{2+}

9.5     Specify the oxidation numbers of the metals in the following coordination entities:

$(i)[Co(H_{2}O)(CN)(en)_{2}]^{2+}$

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Let us assume that coordination number of cobalt is x.

$x\ +\ 0\ +\(-1)\ + 2(0)\ =\ +2$

Thus     $x = 3$

Hence coordination number of cobalt is +3.

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