In which of the following species central atom is NOT surrounded by exactly 8 valence electrons?
(a)
(b)
(c) PC
(d)
Which bond is expected to be the least polar?
(1) O-F
(2) P-F
(3) Si-N
(4) B-F
Which set contains only covalently bonded molecules?
(a)
(b)
(c)
(d)
is:
(1) non-polar compound
(2) electrovalent compound
(3) having low value of dipole moment than
(4) having more dipole moment than
Which of the following statement is true for according to VSEPR theory?
(A) The lone pair and two I-O double bonds occupy the equatorial positions of trigonal
bipyramidal.
(B) It has hybridization and is T-shaped.
(C) Its structure is analogous to .
(D) (A) and (C) both
Which of the following is most covalent?
1. \(AlF_3\)
2. \(AlCl_3\)
3. \(AlBr_3\)
4. \(AlI_3\)
Among LiCl, BeCl2, BCl3 and CCl4, the covalent bond character follows the order-
1. LiCl < BeCl2 > BCl3 > CCl4
2. LiCl > BeCl2 < BCl3 < CCl4
3. LiCl < BeCl2 < BCl3 < CCl4
4. LiCl > BeCl2 > BCl3 > CCl4
The dipole moment of toluene is 0.36 D. The dipole moment of o-xylene would be
1. 0.0 D
2. 0.36 D
3. 0.62 D
4. 0.92 D
A molecule among the following with non-zero dipole moment is:
1.
2.
3.
4.
Both isoelectronic but in contrast to is chemically inert due to
1. Unsymmetrical electron distribution
2. Low bond energy
3. The pressure of a greater number of electrons in bonding orbitals
4. Absence of bond polarity