M.O.T Past Year (2006 - 2015) MCQs 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

The decreasing order of stability of $O_{2}, O_{2}^{-}, O_{2}^{+}$ $and$ $O_{2}^{2 -}$ is:

1. $O_{2}^{+} > O_{2} > O_{2}^{-} > O_{2}^{2 -}$

2. $O_{2}^{2 -} > O_{2}^{-} > O_{2} > O_{2}^{+}$

3. $O_{2} > O_{2}^{+} > O_{2}^{2 -} > O_{2}^{-}$

4. $O_{2}^{-} > O_{2}^{2 -} > O_{2}^{+} > O_{2}$

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Which of the following options represents the correct bond order?

O_{2}^{-} > O_{2} < O_{2}^{+}

O_{2}^{-} < O_{2} > O_{2}^{+}

O_{2}^{-} < O_{2} < O_{2}^{+}

O_{2}^{-} > O_{2} > O_{2}^{+}

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The correct order of bond order in the following species is:

1.	$\mathrm{O}^{2+}_2>\mathrm{O}^+_2>\mathrm{O}^-_2$	2.	$\mathrm{O}^{2+}_2<\mathrm{O}^-_2<\mathrm{O}^+_2$
3.	$\mathrm{O}^{+}_2>\mathrm{O}^-_2<\mathrm{O}^{2+}_2$	4.	$\mathrm{O}^{-}_2<\mathrm{O}^+_2>\mathrm{O}^{2+}_2$

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A paramagnetic molecule among the following is:

1.	O₂^–	2.	CN^–
3.	NO⁺	4.	CO

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The pair of species that has the same bond order in the following is:
1. CO, NO⁺
2. NO^–, CN^–
3. O₂, N₂
4. O₂, B₂

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In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic?
1. $\mathrm{O_{2}\rightarrow O_{2}^{+} }$
2. $\mathrm{C_{2}\rightarrow C_{2}^{+} }$
3. $\mathrm{NO\rightarrow NO^{+} }$
4. $\mathrm{N_{2}\rightarrow N_{2}^{+} }$

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The bond order of 1.5 is shown by:

1.	$\text O^+_2$	2.	$\text O^-_2$
3.	$\text O^{2-}_2$	4.	$\text O_2$

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The pair of species with the same bond order is:

1. $O_{2}^{2 -},$ $B_{2}$

2. $O_{2}^{+}, {NO}^{+}$

3. $\text {NO, CO}$

4. $N_{2}, O_{2}$

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

1. $π$ $orbital$

2. $σ *$ $orbital$

3. $σ$ $orbital$

4. $π *$ $orbital$

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Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them.
1. O₂^– < NO < C₂^2–< He₂⁺
2. C₂^2–< He₂⁺ < O₂^–< NO
3. He₂⁺ < O₂^–< NO < C₂^2–
4. NO < O₂^– < C₂^2– < He₂⁺

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1.	\(\mathrm{O}^{2+}_2>\mathrm{O}^+_2>\mathrm{O}^-_2\)	2.	\(\mathrm{O}^{2+}_2<\mathrm{O}^-_2<\mathrm{O}^+_2\)
3.	\(\mathrm{O}^{+}_2>\mathrm{O}^-_2<\mathrm{O}^{2+}_2\)	4.	\(\mathrm{O}^{-}_2<\mathrm{O}^+_2>\mathrm{O}^{2+}_2\)

1.	\(\text O^+_2\)	2.	\(\text O^-_2\)
3.	\(\text O^{2-}_2\)	4.	\(\text O_2\)

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