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Question

CO is isoelectronic with


A

NO+

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B

N2

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C

SnCl2

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D

NO2

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Solution

The correct option is B

N2


Explanation for correct answer:

Option (A): NO+

  • Isoelectronic species have the same number of electrons but the individual atoms may be different.
  • Isoelectronic species may be a molecule or an ion.
  • In the case of CO, it has 14 electrons.
  • NO+has 14 electrons.
  • Thus, NO+ and CO are isoelectronic species.

Option (B) : N2

  • N2 has 14 electrons.
  • N2and CO both have the same number of electrons i.e., 14 electrons.
  • Thus, N2 and CO are isoelectronic species.

Explanation for incorrect answer:

Option (C) : SnCl2

  • SnCl2 has 82 electrons.
  • For a species to be isoelectronic the species must have to have the same number of electrons.
  • SnCl2 has 82 electrons, whereas CO has 14 electrons.
  • Thus, SnCl2and CO are not isoelectronic.

Option (D) : NO2

  • NO2 has 23 electrons.
  • For a species to be isoelectronic the species must have to have the same number of electrons.
  • NO2 has 23 electrons, whereas CO has 14 electrons.
  • Thus, NO2 and CO are not isoelectronic.

Therefore, the correct options are (A) and (B).


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