MCQs on Polarisation and Fajans Rule
1. The molecule, which contains sp3d2 and p orbitals overlapping in it is
(a) PCl5
(b) BrF5
(c) ClF3
(d) IF7
Answer:::: (b)
2. Homolytic fission of C-C bond of ethane (C2H6) which gives an intermediate in which carbon atom is
(a) sp3 hybridised
(b) sp2 hybridised
(c) sp hybridised
(d) sp3d hybridised
Answer:::: (b)
3. Which of the following compounds has the electron pair geometry as trigonal bipyramidal with three equatorial positions occupied by lone pairs of electrons?
(a) AlCl3
(b) XeF2
(c) Pt(NH3)2Cl
(d) CH3MgBr
Answer:::: (b)
4. Select correct statement
(a) Cations with 18 electron shells have greater polarising power than the cations with 8-electron shells.
(b) Inner shell electrons have a poor shielding effect on the nucleus and thus electronegativity of the 18 electron shell is increased.
(c) CuCl is covalent and NaCl is ionic
(d) All are correct statements
Answer:::: (d)
5. In BrF3 molecule the lone pairs occupy an equatorial position to minimise
(a) lone pair-bond pair repulsion only
(b) bond pair-bond pair repulsion only
(c) lone pair-lone pair repulsion and lone pair-bond pair repulsion
(d) lone pair-lone pair repulsion only
Answer:::: (d)
6. The hybridisation of phosphorous in POCl3 is the same as in
(a) P in PCl3
(b) S in SF4
(c) Cl in ClF3
(d) B in BCl3
Answer:::: (a)
7. If the bond length and dipole moment of diatomic molecules are 1.25Ao and 1.0D respectively, what is the percent ionic character of the bond?
(a) 10.66
(b) 12.35
(c) 16.66
(d) 19.33
Answer:::: (c)
8. The molecule MLx is planar with six pairs of electrons around M in the valence shell. The value of x is
(a) 6
(b) 2
(c) 4
(d) 3
Answer:::: (c)
9. Total number of electron pairs in PCl5, PCl4+ and PCl6– are respectively
(a) 20, 16, 24
(b) 24, 16, 20
(c) 16, 20, 24
(d) 24, 20, 16
Answer:::: (a)
10. If the water molecule is linear
(a) it would have a very high boiling point
(b) it would be highly reactive
(c) its dipole moment would be zero
(d) it would be highly ionic
Answer:::: (c)
