Which of the following would have a permanent dipole moment ?

(a) BF₃

(b) SiF₄

(c) SF₄

(d) XeF₄

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

(a) MCl > MI > MBr > MF

(b) MF > MCl >  MBr > MI 

(c)MF > MCl > MI > MBr

(d) MI > MBr > MCl > MF

Which of the following two are isostructural? 

(a)XeF₂, and IF₂^-

(b)NH₃, and BF₃

(c)CO₃^2-, and SO₃^2-

(d)PCl₅, and ICl₅

Which one of the following species does not exist?

(a) ${\mathrm{Be}}_2^{+}$

(b) Be₂

(c) B₂

(d) N₂

Which one of the following is not paramagnetic ?

(a) NO

(b) ${\mathrm{N}}_2^{+}$

(c) CO

(d) ${\mathrm{O}}_2^{-}$

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

(a) 3

(b) 2

(c) 6

(d) 4

Which of the following is not isostructural with SiCl₄? 

(a) SCl₄     

(b) SO₄^2-

^{(c) PO₄3-}

(d) 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 ?

(a) SF₄

(b) ${\mathrm{I}}_3^{-}$

(c) ${\mathrm{SbCl}}_5^{2-}$

(d) PCl₅

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

(a) ${\mathrm{NO}}_3^{-}$

(b) ${\mathrm{SO}}_3^{2-}$

(c) ${\mathrm{BO}}_3^{3-}$

(d) ${\mathrm{CO}}_3^{2-}$

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

(a) lone pair-bond pair repulsion

(b) bond pair-bond pair repulsion

(c) lone pair-lone pair repulsion and lone pair-bond pair repulsion

(d) lone pair-lone pair repulsion