Which of the following set of molecules will have zero dipole moment?
 

1.	Boron trifluoride, hydrogen fluoride,  carbon dioxide, 1 3-dichlorobenzene
2.	Nitrogen trifluoride, beryllium difluoride,  water, 1 3 -dichlorobenzene
3.	Boron trifluoride, beryllium difluoride, carbon dioxide, 1 4-dichlorobenzene
4.	Ammonia, beryllium difluoride, water,  1, 4-dichlorobenzene

Match the following:

Which of the following is the correct option? 

A molecule that cannot exist is-

1. ${\mathrm{Li}}_2$

2. ${\mathrm{C}}_2$

3. ${\mathrm{O}}_2$

4. ${\mathrm{He}}_2$

Which of the compounds depicted below will exhibit a linear structure?

1. NO₂

2. HOCl

3. O₃

4. N₂O

Match the coordination number and type of hybridization with the distribution of hybrid orbitals in space based on Valence bond theory.

Which of the following is the correct order of dipole moment for the species given?

1. $N{H}_3<B{F}_3<N{F}_3<H_{2}O$

2. $B{F}_3<N{F}_3<N{H}_3<H_{2}O$

3. $B{F}_3<N{H}_3<N{F}_3<H_{2}O$

4. $H_{2}O<N{F}_3<N{H}_3<B{F}_3$

Which of the following is a paramagnetic compound?

1. ${\mathrm{N}}_2$

2. ${\mathrm{H}}_2$

3. ${\mathrm{Li}}_2$

4. ${\mathrm{O}}_2$

Match the oxide given in column I with its property given in column II:

Which of the following options is correct?

During change of $O_2$ to $O_2^{-}$ ion, the electron adds on which one of the following orbitals? 

1.  $\pi$ $orbital$ $$

2.  $\sigma *$ $orbital$ $$

3.  $\sigma$ $orbital$

4.  $\pi *$ $orbital$ $$