Which of the following would have a permanent dipole moment ?

(1) BF₃

(2) SiF₄

(3) SF₄

(4) XeF₄

In the case of alkali metals, the covalent character decreases in the order

(1) MCl > MI > MBr > MF

(2) MF > MCl >  MBr > MI 

(3)MF > MCl > MI > MBr

(4) MI > MBr > MCl > MF

Which of the following two are isostructural? 

(1)XeF₂, and IF₂^-

(2)NH₃, and BF₃

(3)CO₂, and SiO₂

(4)PCl₅, and IF₅

Which one of the following species does not exist?

(1) ${\mathrm{Be}}_2^{+}$

(2) Be₂

(3) B₂

(4) N₂

Which one of the following is not paramagnetic ?

1. NO

2. ${\mathrm{N}}_2^{+}$

3. CO

4. ${\mathrm{O}}_2^{-}$

In a regular octahedral molecule, MX₆ the number of X-M-X bonds at 180$°$is

(1) 3

(2) 2

(3) 6

(4) 4

Which of the following is not isostructural with SiCl₄? 

(1) SCl₄     

(2) SO₄^2-

^{(3) PO₄3-}

(4) NH₄⁺

In which of the following species the central atom has the type of hybridisation which is not the same as that present in the other three ?

(1) SF₄

(2) ${\mathrm{I}}_3^{-}$

(3) ${\mathrm{SbCl}}_5^{2-}$

(4) PCl₅

Which of the following has $\mathrm{p\pi } -\mathrm{d\pi }$-bonding ?

1. ${\mathrm{NO}}_3^{-}$

2. ${\mathrm{SO}}_3^{2-}$

3. ${\mathrm{BO}}_3^{3-}$

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

In BrF₃ molecule, the lone pairs occupy equatorial positions to minimise :

1. lone pair-bond pair repulsion

2. bond pair-bond pair repulsion

3. lone pair-lone pair repulsion and bond pair-bond pair repulsion

4. lone pair-lone pair repulsion