Which one of the 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 ${\mathrm{NH}}_4^{+}$]

Bond order of 1.5 is shown by

(a) ${\mathrm{O}}_2^{+}$     

(b) ${\mathrm{O}}_2^{-}$       

(c) ${\mathrm{O}}_2^{2-}$     

(d) O₂

What is the dominant intermolecular force on bond that must be overcome in converting liquid CH₃OH to a gas?

(a) Hydrogen bonding

(b) Dipole-dipole interaction

(c) Covalent bonds

(d) London dispersion force

The correct order of electronegativity of hybrid orbitals of carbon is:

1. sp > sp² < sp³             

2. sp > sp² > sp³

3. sp < sp² > sp³             

4. sp < sp² < sp³

${\mathrm{H}}_2\mathrm{O}$ has a net dipole moment while
\(BeF_2\) has zero dipole moment because :

1. F is more electronegative than oxygen.

2. Be is more electronegative than oxygen. 

3. ${\mathrm{H}}_2\mathrm{O}$ $$ molecule is linear and \(BeF_2\) is bent.

4. ${\mathrm{BeF}}_2$ molecule is linear and ${\mathrm{H}}_2\mathrm{O}$ is bent.

Which of the following compound have the same no. of lone pair on their central atom?

(a)${\mathrm{XeF}}_5^{- }$             (b) ${\mathrm{BrF}}_3$                 (c) ${\mathrm{XeF}}_2$                     (d) ${\mathrm{H}}_3{\mathrm{S}}^{+}$               

(e) Triple Methylene     

options are as follows :        

(a) (iv) and (v)                                     (b) (i) and (iii) 

(c) (i) and (ii)                                       (d) (ii) (iv), (v)

In which of the following species central atom is NOT surrounded by exactly 8 valence electrons?

(a) $B{F_4}^{-}$

(b) $NC{l}_3$

(c) PC${l_4}^{+}$

(d) $S{F}_4$

Which bond is expected to be the least polar?

(1) O-F

(2) P-F

(3) Si-N

(4) B-F 

Which set contains only covalently bonded molecules?

(a) $BC{l}_{3 }, SiC{l}_4 ,PC{l}_3$

(b) $N{H}_{4}Br , N_2{H}_4,HBr$

(c) $I_{2 ,}{H}_{2}S , NaI$

(d) $A{l}_2,O_{3 }, A{S}_4$