Which of the following species contains three bond pairs and one lone pair around the central atom?

1. ${\mathrm{H}}_2\mathrm{O}$

2. $B{F}_3$

3. ${\mathrm{NH}}_2^{-}$

4. ${\mathrm{PCl}}_3$

The pair of species with the same bond order is

1. $O_2^{2-}, B_2$

2. $O_2^{+},N{O}^{+}$

3. NO,CO

4. $N_2,O_2$

Which of the two ions from the list given below have the geometry that is explained by the same hybridisation of orbitals, ${\mathrm{NO}}_2^{-},{\mathrm{NO}}_3^{-},{\mathrm{NH}}_2^{-},{\mathrm{NH}}_4^{-}, \mathrm{and} {\mathrm{SCN}}^{-}$ ?

1.  ${\mathrm{NH}}_4^{-} \mathrm{and} {\mathrm{NO}}_3^{-}$

2.  ${\mathrm{SCN}}_{}^{-} \mathrm{and} {\mathrm{NH}}_2^{-}$

3.  ${\mathrm{NO}}_2^{-} \mathrm{and} {\mathrm{NH}}_2^{-}$

4.  ${\mathrm{NO}}_2^{-} \mathrm{and} {\mathrm{NO}}_3^{-}$

Which of the following has the minimum bond length?

In which one of the following species the central atom has the type of hybridization which is not the same as that present in the other three ?

1. ${\mathrm{SF}}_4$

2. ${\mathrm{I}}_3^{-}$

3. ${\mathrm{SbCl}}_5^{2-}$

4. ${\mathrm{PCl}}_5$

According to the MO theory, which of the following lists ranks the nitrogen species in terms of increasing bond order?

1. $N_2^{-}<N_2<N_2^{2-}$

2. $N_2^{2-}<N_2^{-}<N_2$

3. $N_2<N_2^{2-}<N_2^{-}$

4. $N_2^{-}<N_2^{2-}<N_2$

What is the correct order of C−O bond lengths among \(\mathrm{CO},\mathrm{CO}_3^{2-},\) and \(\mathrm{CO_2}\) ?

1. \(\mathrm{CO}_2<\mathrm{CO}_3^{2-}<\mathrm{CO} \)
2. \(\mathrm{CO}<\mathrm{CO}_3^{2-}<\mathrm{CO}_2 \)
3. \(\mathrm{CO}_3^{2-}<\mathrm{CO}_2<\mathrm{CO} \)
4. \(\mathrm{CO}<\mathrm{CO}_2<\mathrm{CO}_3^{2-}\)

Which of the following is not a correct statement?

Which of the following is not isostructural with SiCl₄?

1. \(SCl_4\)

2. \(SO_4^{2-}\)

3. \(PO_4^{3-}\)

4. \(NH_4^+\)
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Which of the following diatomic molecular species has only $\mathrm{\pi }$ bonds according to Molecular Orbital Theory?

1.  Be₂

2.  O₂

3.  N₂

4.  C₂