M.O.T Chemical Bonding and Molecular Structure Chemical Bonding and Molecular Structure Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

If an extra electron is added to the hypothetical molecule C₂, this extra electron will occupy the molecular orbital:

1.	$\pi_{2p}$*	2.	$\pi_{2p}$
3.	$\sigma_{2p}$*	4.	$\sigma_{2p}$

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Q2:

The bond order and magnetic behaviour exhibited by $\text C_2$ molecule are:

1.	3 and paramagnetic	2.	2 and paramagnetic
3.	3 and diamagnetic	4.	2 and diamagnetic

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Q3:

A molecule that cannot exist is:

1.	${Li}_{2}$	2.	$C_{2}$
3.	$O_{2}$	4.	${He}_{2}$

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Q4:

Overlapping of orbital that does not produce $σ$ bond is:
(Assume z is the internuclear axis)

1.	p_z - p_z	2.	s - p_z
3.	s - s	4.	p_x - p_x

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Q5:

Given below are two statements:

Assertion (A):	An atomic orbital is monocentric, whereas a molecular orbital is polycentric.
Reason (R):	An electron in an atomic orbital is influenced by one nucleus whereas in a molecular orbital, it is influenced by two or more nuclei depending upon the number of atoms in a molecule.

In the light of the above statements, choose the most appropriate answer from the options given below:

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

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Q6:

Which one of the following statements is incorrect related to Molecular Orbital Theory?

1.	The $\pi^*$ antibonding molecular orbital has a node between the nuclei.
2.	In the formation of a bonding molecular orbital, the two electron waves of the bonding atoms reinforce each other.
3.	Molecular orbitals obtained from $2P_x$ and $2P_y$ orbitals are symmetrical around the bond axis.
4.	A $\pi-$bonding molecular orbital has larger electron density above and below the internuclear axis.

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Q7:

Diamagnetic species are those which contain no unpaired electrons. Among the following, diamagnetic species are

(a)	$N_{2}$	(b)	$N_{2}^{2 -}$
(C)	$O_{2}$	(d)	$O_{2}^{2 -}$

Choose the correct option:

1.	(a), (d)	2.	(b), (c)
3.	(c), (d)	4.	(b), (d)

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Q8:

Identify the species with identical bond orders from the following options.

(a) $N_{2}$

(b) $N_{2}^{-}$

(c) $F_{2}^{+}$

(d) $O_{2}^{-}$

Choose the correct option:

1. (a), (d)

2. (b), (c)

3. (c), (d)

4. (b), (d)

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Q9:

Of the species, NO , NO⁺, NO²⁺ and NO^– , the one with minimum bond strength is:

1. NO²⁺

2. NO⁺

3. NO

4. NO^–

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Q10:

According to molecular orbital theory, which of the following molecules is not expected to be stable?

1.	$\mathrm{He}_2^{2+}$	2.	$\mathrm{He}_2^{+}$
3.	$\mathrm{H}_2^{-}$	4.	$\mathrm{H}_2^{2-}$

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1.	\(\pi_{2p}\)*	2.	\(\pi_{2p}\)
3.	\(\sigma_{2p}\)*	4.	\(\sigma_{2p}\)

1.	The \(\pi^*\) antibonding molecular orbital has a node between the nuclei.
2.	In the formation of a bonding molecular orbital, the two electron waves of the bonding atoms reinforce each other.
3.	Molecular orbitals obtained from \(2P_x\) and \(2P_y\) orbitals are symmetrical around the bond axis.
4.	A \(\pi-\)bonding molecular orbital has larger electron density above and below the internuclear axis.

1.	\(\mathrm{He}_2^{2+}\)	2.	\(\mathrm{He}_2^{+}\)
3.	\(\mathrm{H}_2^{-}\)	4.	\(\mathrm{H}_2^{2-}\)

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