The bond order in NO is 2.5 while that in NO${}^{+}$ is 3.

Which of the following statements is true for these

two species? 

1. bond length in NO${}^{+}$ is greater than in NO

2. bond length in NO is greater than in NO${}^{+}$

3. bond length in NO${}^{+}$ is equal than in NO

4. bond length is unpredictable

Which of the following has the regular tetrahedral structure

1. [Ni(CN${}_4$)]${}^{2-}$

2. SF${}_4$

3. ${{\mathrm{BF}}_4}^{-}$

4. XeF${}_4$

Which of the following types of hybridisation exhibits the highest number of 90° bond pair-bond pair electron angles?
 

1. ${\mathrm{sp}}^3{\mathrm{d}}^2$ hybridisation.

2. ${\mathrm{sp}}^3\mathrm{d}$ hybridisation.

3. ${\mathrm{sp}}^3$ hybridisation.

4. ${\mathrm{dsp}}^2$ hybridisation. 

Molecule/Ion that is diamagnetic in nature is: 

The extent of lattice energy in an ionic compound depends on:

1. Packing of ions only 

2. Size of the ions only 

3. Charge and Size of the ions 

4. Charge on the ions only

The number and type of bonds between two carbon atoms in calcium carbide are 

1. One sigma, two pi

2. Two sigma, two pi 

3. One sigma, one pi 

4. Two sigma, one pi 

Which among the following does not contain a set of isoelectronic species?

1. $\mathrm{S}{{\mathrm{O}}_3}^{2-\mathrm{}}$, CO₃^2-, NO₃^-

2. ${\mathrm{CN}}^{-}, {\mathrm{N}}_2, \mathrm{CO}$

3. ${\mathrm{BO}}_3^{3-} , {\mathrm{CO}}_3^{2- },\mathrm{N}{{\mathrm{O}}_3}^{-}$

4. ${\mathrm{PO}}_4^{3-}, {\mathrm{SO}}_4^{2-}, \mathrm{Cl}{{\mathrm{O}}_4}^{-}$

Which of the following molecules/ions does not contain unpaired electrons?

(1) O${}_2^{ 2-}$

(2) ${{\mathrm{C}}_2}^{-}$

(3) $N_2^{+}$

(4) O${}_2$

A molecule or ion that has an unequal bond length is:

Which of the following species exhibits the diamagnetic behaviour?

(1) O${}_2^{ +}$

(2) O${}_2$

(3) NO

(4) O${}_2^{ 2-}$