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 under normal conditions ?

(a) ${\mathrm{Be}}_2^{+}$

(b) Be₂

(c) B₂

(d) Li₂

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

The angular shape of ozone molecule (O₃) consists of 

(a) 1 sigma and 2 pi-bonds

(b) 2 sigma and 2 pi-bonds

(c) 1 sigma and 1 pi-bonds

(d) 2 sigma and 1 pi-bonds

Which of the following is not isostructural with SiCl₄? 

(a) SCl₄     

(b) SO₄^2-

^{(c) PO₄3-}

(d) NH₄⁺

In which of the following molecules are all the bonds not equal ?

[2006]

(a) ClF₃

(b) BF₃

(c) AlF₃

(d) NF₃

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

(a)Cl₂O < ClO₂ < ${\mathrm{ClO}}_2^{-}$

(b) ClO₂ < Cl₂O < ${\mathrm{ClO}}_2^{-}$

(c) Cl₂O < ${\mathrm{ClO}}_2^{-}$ < ClO₂  

(d) ${\mathrm{ClO}}_2^{-}$ < ClO₂ < Cl₂O