Identify the wrong statement among the following.

1.	Amongst isoelectronic species, the smaller the positive charge on the cation, the smaller is the ionic radius
2.	Amongst isoelectronic species, the greater the negative charge on the anion, the larger is ionic radius
3.	Atomic radius of the elements increases as one moves down the first group of the periodic table
4.	Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table

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

1. \(\text H_{2} \text O\)

2. \(\text{BF}_{3}\)

3. \(\text{NH}^-_2\)

4. \(\text{PCl}_{3}\)

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. $N_2,O_2$

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

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 one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has a high melting point?

1. Metallic bonding

2. Van der Waals' bonding

3. Ionic bonding

4. Covalent bonding

In which of the following pairs of molecules/ions, the central atoms have sp² hybridization?

1. $N{O}_2^{-}$ $and$ $N{H}_3$

2. $B{F}_3$ $and$ $N{O}_2^{-}$

3. $N{H}_2^{-}and$ $H_{2}O$

4. $B{F}_3$ $and$ $N{H}_2^{-}$

A molecule/ion among the following species that does not exist under normal conditions is:

1. \(Be^+_2\)
2. \(Be_2\)
3. \(B_2\)
4. \(Li_2\)

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

1. \(C l_{2} O < C l O_{2} < C l O_{2}^{-}\)

2. \(C l O_{2} < C l_{2} O < C l O_{2}^{-}\)

3. \(C l_{2} O < C l O_{2}^{-} < C l O_{2}\)

4. \(C l O_{2}^{-} < C l_{2} O < C l O_{2}\)

The correct state of hybridisation of C₂, C₃, C₅ and C₆ of the hydrocarbon 

 is in the sequence:
1. sp, sp³, sp² and sp³
2. sp³, sp², sp² and sp
3. sp, sp², sp² and sp³
4. sp, sp², sp³ and sp²

The correct order of increasing bond order among the given is:

1. ${\mathrm{O}}_2^{-}$ $<$ $\mathrm{NO}$ $<$ ${\mathrm{C}}_2^{2-}$ $<$ ${\mathrm{He}}_2^{+}$

2. $\mathrm{NO}$ $<$ ${\mathrm{C}}_2^{2-}$ $<$ ${\mathrm{O}}_2^{-}$ $<$ ${\mathrm{He}}_2^{+}$

3. ${\mathrm{C}}_2^{2-}$ $<$ ${\mathrm{He}}_2^{+}$ $<$ $\mathrm{NO}$ $<$ ${\mathrm{O}}_2^{-}$

4. ${\mathrm{He}}_2^{+}$ $<$ ${\mathrm{O}}_2^{-}$ $<$ $\mathrm{NO}$ $<$ ${\mathrm{C}}_2^{2-}$