Which of the following two are isostructural? 

1. XeF₂, and IF₂^-

2. NH₃, and BF₃

3. CO₂, and SiO₂

4. PCl₅, and IF₅

Which of the following is isoelectronic? 

1. ${\mathrm{CO}}_2, {\mathrm{NO}}_2$

2. ${\mathrm{NO}}_2^{-}, {\mathrm{CO}}_2$

3. ${\mathrm{CN}}^{-}, \mathrm{CO}$

4. ${\mathrm{SO}}_2, {\mathrm{CO}}_2$

The isostere pair is

1. CO₂ and N₂O

2. CO and N₂

3. O₂ and NO₂

4. Both (1) and (2)

Which of the following pairs share both isoelectronicity and isostructural characteristics?

${\mathrm{NO}}_3^{-}, {\mathrm{CO}}_3^{-2}, {\mathrm{ClO}}_3^{-}, {\mathrm{SO}}_3$

1. ${\mathrm{NO}}_3^{-}, {\mathrm{CO}}_3^{-2}$

2. ${\mathrm{SO}}_3, {\mathrm{NO}}_3^{-}$

3. ${\mathrm{ClO}}_3^{-}, {\mathrm{CO}}_3^{-2}$

4. ${\mathrm{CO}}_3^{-2}, {\mathrm{ClO}}_3^{-}$

Carbon suboxide (C₃O₂) has

1. Linear structure

2. Bent structure

3. Trigonal structure

4. Disorted tetrahedral structure

The total number of $\mathrm{\pi }$-bond electrons in the following structure is

1. 4       

2. 8         

3. 12         

4. 16

Which one of he following pairs is isostructural (i.e., having the same shape and

hybridization)?

1. [BCl₃ and BrCl₃]

2. [NH₃ and ${\mathrm{NO}}_3^{-}$]

3. [NF₃ and BF₃]

4. [${\mathrm{BF}}_4^{-}$ and ${\mathrm{NH}}_4^{+}$]

Considering the state of hybridisation of carbon atoms, find out the molecule among the

following which is linear.

1. HC≡CH

2. CH₂ = CH—CH₂—C = CH

3. CH₃ — CH₂ — CH₂ — CH₃

4. CH₃—CH = CH—CH₃

The angular shape of ozone molecule (O₃) consists of

1. 1 sigma and 2 pi bonds

2. 2 sigma and 2 pi bonds

3. 1 sigma and 1 pi bonds

4. 2 sigma and 1 pi bonds

Which of the following overlops is incorrect (assuming Z axis internuclear axis)?

(A) $2p_{y }+2p_y\to \pi ‐Bond formation$        (B) $2p_x+2p_x\to \sigma ‐Bond formation$

(C) $3d_{xy}+3d_{xy}\to \pi ‐ Bond formation$        (D) $2s+2p_y\to \pi ‐Bond formation$

(E)$3d_{xy}+3d_{xy}\to \delta Bond formation$             (F)$2p_z+2p_z\to \sigma Bond formation$

(a) A,B,C                      (b) C,F

(c) B,E                         (D) B,C,D