CHAP NO.3 THEORIES OF COVALENT BOND AND SHAPES OF MOLECULES

1.	Which one of the following is not possible a. Cl2 b. He2 c. O2 d. N2	B
2.	Choose correct about occupying space a. Lone pair- lone pair > lone pair-bond pair > bond pair Bond pair b. Lone pair- lone pair < lone pair-bond pair < bond pair Bond pair c. Lone pair- lone pair > lone pair-bond pair < bond pair Bond pair d. Lone pair- lone pair < lone pair-bond pair > bond pair Bond pair	B
3.	Which one of the following is angular sturucture a. BeCl2 b. BF3 c. SnCl2 d. CH4	C
4.	Trigonal structure is that of a. SnCl2 b. CH4 c. NH3 d. H2O	C
5.	Which one of the following has resonance structure a. Benzene b. Ozone c. 1-3 Butadiene d. All of these	D
6.	The bond energy of resonance hybrid a. Is equal to calculated value b. Is less than calculated value c.Is more than calculated value d. Resonance has no energy	B
7.	The bond in HCl is a. s-s b. s-p c. p-p d. pi bond	B
8.	hybridization was introduced by a. Ingold b. Heisenberg c. Pauling and Slatter d. Non of these	C
9.	Which one of the following is hybridization of sp2 a. Methane b. Ethane c. Ethane d. Propyne	C
10.	Oxygen have paramagnetic property according to a. Valence bond theory b. Valence shell electron pair repulsion theory c. Molecular orbital theory d. Non of these	B
11.	Molecule is stable if a.  nb = na b. nb < na c. nb > na d. non of these	C
12.	The bond energy for one chlorine atom is about…… KJ per mole a. 436 kj b. 36.21 x 10-21 c. 55.94 x 10-23 d. 72.39 x 10-23	B
13.	If electronegativity value between two atoms is between 0.9-1.7, then the bond is a. Covalent character b. Ionic bond c. Polar with some ionic character d. Non of these	C
14.	The relation between Debye to SI unit is a. 1D = 3.34 x 10-30 Cm b. 1Cm = 3.34 x 10-30 D c. 1D = 3.34 x 1030 Cm d. 1D = 3.34 x 10-33 Cm	A
15.	Percentage of ionic character a. (μobserved / μionic ) x 10 b. (μionic / μobserved) x 10 c. (μobserved / μionic ) x 100 d. (μionic / μobserved) x 100	C
16.	The structure water is a. Linear b. Angular c. Triangular d. All of these	B
17.	Which one of the following is true for covalent and ionic bond, a. Reaction of covalent are slow than ionic b. Reaction of covalent are fast than ionic c. Covalent and ionic character have same speed of reaction d. Covalent compound do not react	A
18.	Bond is formed because an atom a. Tend to lose electron b. Tend to gain electron c. Tend to complete its octet d. All of the above	D
19.	Bond formation between atoms a. Increase energy and decrease stability b. Decrease energy and increase stability c. Increase energy and increase stability d. No change in energy	B
20.	Which atom has zero dipole moment a. NH3 b. NF3 c. BF3 d. H2O	C
21.	Species in which the central atom uses sp2 hybrid orbitals in its bonding a. PH3 b. NH3 c. CH3+ d. SbH3	C
22.	Carbon monoxide molecules …… covalent bonds a. 1 b. 2 c. 3 d. 4	B
23.	The lattice energy of ionic compounds are a. Low b. High c. Zero d. None	B
24.	Which one of the following have greater additional bond energy? a. XF b. XCl c. XBr d. XI	A
25.	The bond will be covalent if E>N difference is a. Less than 0.9 b. Greater than 1.7 c. Is in between 0.9-1.7 d. Greater than 1.9	A