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Which of the following is isoelectronic ?

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Which of the following is isoelectronic ?
A. `CO_2 , NO_2`
B. `NO_2^(-) , CO_2`
C. `CN^(-), CO`
D. `SO_2 , CO_2`
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Correct Answer - C
`CN^-` and CO are isoelectronic because they have equal number of electrons.
In `CN^-` the number of electrons =6+7+1=14
In CO the number of electrons =6+8=14
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