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 IF_2
(b)NH3, and BF3
(c)CO32-, and SO32-
(d)PCl5, and ICl5
Which one of the following species does not exist under normal conditions ?
In a regular octahedral molecule, MX6 the number of X-M-X bonds at 180is
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
In which of the following molecules are all the bonds not equal ?