Chemical Bonding and Molecular Structure · Chemistry · IAT (IISER)
MCQ (Single Correct Answer)
1
Which among the following processes is/are associated with increasing bond order but no change in diamagnetic/paramagnetic behaviour?
(i) $\mathrm{N}_2 \rightarrow \mathrm{~N}_2^{+}+\mathrm{e}^{-}$
(ii) $\mathrm{O}_2 \rightarrow \mathrm{O}_2^{+}+\mathrm{e}^{-}$
(iii) $\mathrm{O}_2+\mathrm{e}^{-} \rightarrow \mathrm{O}_2^{-}$
IAT (IISER) 2025
2
The dipole moments of three $\mathrm{AB}_3$-type molecules $\mathbf{I}, \mathbf{I I}$, and $\mathbf{I I I}$ are measured to be $0.0 \mathrm{D}, 0.2 \mathrm{D}$, and 1.5 D , respectively. Which one of the following options is correct regarding the identity of $\mathbf{I}, \mathbf{I I}$, and $\mathbf{I I I}$ ?
IAT (IISER) 2025
3
Which one of the following statements is correct about $\mathrm{N}_2, \mathrm{CO}$, and $\mathrm{NO}^{+}$?
IAT (IISER) 2024
4
According to the VSEPR theory, what are the most stable shapes of $X_4 F_4$ and $\mathrm{SF}_4$, respectively?
IAT (IISER) 2024
5
Amongst $\mathrm{O}_2, \mathrm{~N}_2, \mathrm{~F}_2$, and $\mathrm{B}_2$, which molecules will be attracted to an external magnetic field?
IAT (IISER) 2023
6
Identify the correct order of the molecules with respect to the magnitude of their dipole moment:
IAT (IISER) 2022
7
$$ \text { What is the most appropriate Lewis structure of } \mathrm{NO}_2 \mathrm{~F} \text { ? } $$
IAT (IISER) 2020