Multiple Choice

Which of the following species are paramagnetic?

A$$CN^{-}$$
B$$NO$$
Correct Answer
C$$O^{-2}_{2}$$
D$$O_{2}$$
Correct Answer

Solution

1. $$CN^-$$:
valence electrons=$$4+5+1=10$$
$${ \left( \sigma 2s \right) }^{ 2 }{ \left( \sigma *2s \right) }^{ 2 }{ \left( \sigma 2p \right) }^{ 2 }{ \left( \pi 2p \right) }^{ 4 }$$

2. $$NO$$:
valence electrons=$$5+6=11$$
$${ \left( \sigma 2s \right) }^{ 2 }{ \left( \sigma *2s \right) }^{ 2 }{ \left( \sigma 2p \right) }^{ 2 }{ \left( \pi 2p \right) }^{ 4 }\left( \pi ^*2p \right) ^{ 1 }$$

3.$$O_2^{ 2- }$$
valence electrons=$$6+6+2=14$$
$${ \left( \sigma 2s \right) }^{ 2 }{ \left( \sigma *2s \right) }^{ 2 }{ \left( \sigma 2p \right) }^{ 2 }{ \left( \pi 2p \right) }^{ 4 }\left( \pi ^*2p \right) ^{ 4 }$$

4.$$O_2$$:
valence electrons=$$6+6=12$$
$${ \left( \sigma 2s \right) }^{ 2 }{ \left( \sigma *2s \right) }^{ 2 }{ \left( \sigma 2p \right) }^{ 2 }{ \left( \pi 2p \right) }^{ 4 }\left( \pi ^*2p \right) ^{ 2 }$$

Therefore $$no$$ and $$O_2$$ have unpaired electrons, and will thus be paramagnetic.
Hence, option $$B$$ and $$D$$ are correct.

SIMILAR QUESTIONS

Chemical Bonding

The most electronegative element is:

Chemical Bonding

The number of antibonding electron pairs in $$O^{2-}_{2}$$ molecular ion on the basis of molecular orbital theory is :

Chemical Bonding

Among $$KO_2, AlO_2^-, BaO_2, and NO_2^+$$, unpaired electron is present in:

Chemical Bonding

The total number of bonding and antibonding electrons in $$\displaystyle O{_{2}}^{+}$$ are respectively. (If the answer is 14 and 7, then represent as 0147):

Chemical Bonding

State True or False. $$O_2, O_2^-$$ and $$O_2^{2-}$$ are paramagnetic species.

Chemical Bonding

Which of the following molecules is expected to exhibit diamagnetic behaviour?

Chemical Bonding

The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description ?

Chemical Bonding

Which of the following is paramagnetic?

Chemical Bonding

During change of $${O}_{2}$$ to $${O}_{2}^{-}$$ ion, the electron adds on which one of the following orbitals?

Chemical Bonding

When $$O_2$$ is absorbed on a metallic surface, electron transfer occurs from the metal to $$O_2$$. The true statement(s) regarding this adsorption is(are):

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