11th class (FSc) chemistry Unit 6 MCQs
51. The number of bonds in nitrogen molecule is:
a. Three sigma only
b. One sigma and one pi
c. Two sigma and one pi
d. One sigma and two pi
52. Which of the following statement is not correct regarding bonding molecular orbitals?
a. Energy electron in the bonding molecular orbitals contributes to the attraction between atoms.
b. Bonding molecular orbitals posses less energy than atomic orbital from which they are formed
c. Bonding molecular orbitals are formed when electron waves under go constructive interfere
d. Both molecular orbitals have low electron density between the two nuclie
53. which one of the following molecules has zero diple moment?
a. H2O
b. NH3
c. BF3
d. CHCl3
54. Which of the hydrogen halides has the highest percentage of inoniccharacter.
a. HF
b. HCI
c. HI
d. HBr
55. Which of the following species has unpaird if electrons in and-bondingmolecular orbitals.
a. B2
b. O2+2
c. F2
d. N2-2
56. The ability of an atom in a covalent bond to attract the bondingelectrons is called:
a. Electronegativity
b. Ionization energy
c. Electron affinity
d. Ionic bond energy
57. The parameter character of a substance is due to:
a. Unpaired electrons in atom or molecule
b. Bond pair of electrons
c. Paired electrons in valence shells electrons
d. Lone pair of electrons
58. The angle between unhybridized p-orbital and three sp2 hybrid orbitals of each carbon atom in ether is:
a. 109.5o
b. 120o
c. 180o
d. 90o
59. In H-F bond elecronegativity difference is 1.9 what is the type of thisbond?
a. pi (π) bond
b. Polar covalent bond
c. Co-ordinate covalent bond
d. Non-polar covalent bond
60. According to valence shell electron pair repulsion theory, the repulsion forces between the electrons pair of central atoms of molecule are in the order:
a. Bond pair-Bond pair>Lone pair-Lone pair>Lone pair-bond pair
b. Lone pair-Lone pair>Lone pair-bond pair>Bond pair-Bond pair
c. Lone pair-Bond pair>Bond pair-Bond pair-Lone Pair
d. Lone pair-Bond pair>Lone pair-Lone pair>Bond pair-Bond pair
61. In crystal lattic of ice, ech O-atom of water molecule is attached to:
a. One H-atoms
b. Four H-atoms
c. Two H-atoms
d. Three-H-atoms
62. When two partially filled atomic orbitals overlap in such a way that the probability of finding electron is maximum around the line joining the two nuclei the result is the formation of:
a. Hydrogen bond
b. Sigma bond
c. Metallic bond
d. Pi-bond
63. Choose the right molecule:
a. CO
b. CH3
c. NH3
d. H2O
click here to go directly on chapter no.7