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?
Which one of the following is not paramagnetic ?
In a regular octahedral molecule MX6, the number of X-M-X bonds at 180is-
Which of the following is not isostructural with SiCl4?
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 ?
Which of the following has bonding?
In BrF3 molecule, the lone pairs occupy equatorial positions to minimize:
1. Lone pair-bond pair repulsion.
2. Bond pair-bond pair repulsion.
3. Lone pair-lone pair repulsion and lone pair-bond pair repulsion.
4. Lone pair-lone pair repulsion.
In which one of the following molecules, the central atom said to adopt sp2 hybridisation ?