Q.1.
The dipole moment of o,p and m-dichloro benzene will be in the order
-
0%
a) o > p > m
-
25%
b) p > o > m
-
50%
c) m > o > p
-
25%
d) o > m > p
Q.2.
If the electronegativity difference between two atoms A and B is 2.0, then the percentage of covalent character in the molecule is
-
33%
a) 54%
-
33%
b) 46%
-
0%
c)23%
-
33%
d)72%
Q.3.
The bond order in the superoxide (O2-) ion is
-
40%
a)2.5
-
40%
b) 2.0
-
20%
c)1.5
-
0%
d)1.0
Q.4.
The bond energies of NO, NO- and NO- follow the order
-
20%
a) NO+ > NO > NO-
-
40%
b) NO > NO+ > NO-
-
20%
c) NO- > NO > NO+
-
20%
d) NO+ > NO- > NO
Q.5.
In the formation of N2 molecule according to M.O>T the outermost electron goes to
-
25%
a)πMO orbital
-
50%
b) πMO orbital
-
25%
c)π*MO orbital
-
0%
d)σ* MO orbital
Q.6.
Which of the following does not apply to metallic bond? [ CBSE PMT 1989]
-
33%
a) Overlapping valence orbitals
-
33%
b) Mobile valency electrons
-
33%
c) Deloclized electrons
-
0%
d) Highly directed bonds
Q.7.
Which of the following statement is correct about N2 molecule
-
33%
a) It has bond order of 3
-
33%
b) The number of unpaired electrons present in it zero and hence it is diamagetic
-
0%
c)The order of filling of MOs is π(2px=π(2py). σ(2px)
-
33%
d)All the above three statements are correct
Q.8.
Which of the following hydrogen halides has higher percentage of ionic character?
-
33%
a) HF
-
67%
b) HCl
-
0%
c) HBr
-
0%
d) HI
Q.9.
A crystal is hard and has high melting point. It is
-
50%
a)Covalent crystal
-
0%
b) Ionic crystal
-
25%
c)Metallic
-
25%
d)Molecular
Q.10.
The bond order in peroxide ion(O22- is
-
33%
a) 2.5
-
33%
b) 1.5
-
33%
c)2.0
-
0%
d)1.0
Q.11.
Which of the following statement is not correct regarding bonding molecular orbitals
-
0%
a) Bonding molecular orbitals posses less energy than the atomic orbitals from which they are formed
-
75%
b)BOnding molecular orbitals have low electron density between the two nuclei
-
25%
c)Every electron in bonding molecular orbit contributes to the attraction between atoms
-
0%
d)they are formed when the lobs of the combining atomic orbitals have the same sign
Q.12.
Point out the false statement
-
50%
a) A molecule represents a more stable state as compared to individual atoms
-
0%
b) Carbon tetrachloride is a non-polar molecule
-
50%
c) Ionic compounds generally have low m,p, and b.p
-
0%
d) Anhydrous AlCl3 is a covalent substance
Q.13.
Sulphuric acid molecule contains
-
25%
a)Only covalent bonds
-
25%
b) Covalent and ionic bonds
-
25%
c)Covalent and coordination bonds
-
25%
d)Covalent, ionic and coordination bonds
Q.14.
Consider two elements with atomic number 37 and 53 the bond between their atoms would be
-
67%
a) covalent
-
0%
b) ionic
-
0%
c)co-ordinate
-
33%
d)metallic
Q.15.
Which of the following statement is incorrect?
-
0%
a) He2 does not exists because its bond order is zero
-
0%
b)O2, O2- ,O2+ are all paramagnetic
-
67%
c)Any two atomic orbitals can combine to form two molecular orbitals
-
33%
d)π(2px) and π(2py) are degerate molecular orbitals
Q.16.
Which of the following pairs of elements form a compound with maximum ionic character
-
50%
a) Na, Cl
-
0%
b) K, I
-
0%
c) Cs, F
-
50%
d) Ca, F
Q.17.
Which of the following molecules have unpaired electrons in antibonding molecular orbitals
-
33%
a)O2
-
0%
b) N2
-
0%
c)C2
-
67%
d)B2
Q.18.
Which one is paramagnetic and has bond order of ½
-
50%
a) O2-
-
0%
b) N2+
-
50%
c)F2
-
0%
d)H2+
Q.19.
BF3 and NF3 both are polar covalent compounds but NF3 is polar where as BF3 is non-polar. This is because
-
0%
a) Nitrogen atom is smaller than boron atom
-
50%
b) N-F bond is more polar than B-F bond
-
50%
c) NF3 is pyramidal where as BF3 is planar triangular
-
0%
d) BF3 is electron deficient where as NF3 is not
Explanation
Q.20.
The compound contain both ionic and covalent bonds is
-
0%
a)CH4
-
100%
b) H2
-
0%
c)KCN
-
0%
d)KCl
Q.21.
Which sequence correctly describes the relative bond strength of oxygen molecule, superoxide ion, peroxide ion and unipositive oxygen molecule
-
0%
a) O2+ > O2- > O22- > O2
-
0%
b) O2+ > O2 > O2- > O2-2
-
50%
c)O22- > O2- > O2 > O2+
-
50%
d)O22- > O2- > O2+ > O2
Q.22.
Bond order is
-
0%
a) directly related to bond length
-
0%
b) inversely related to bond length
-
0%
c)inversely related to bond strength
-
100%
d)never fractional
Q.23.
The correct order of decreasing polarity is
-
33%
a) HF > SO2 >H2O > NH3
-
0%
b) HF >H2O > SO2 > NH3
-
33%
c) H2O > NH3 > SO2 >H2O
-
33%
d) H2O> NH3> SO2 > HF
Q.24.
Which of the following theory provides good explanation about the paramagnetic behavior of Oxygen
-
0%
a)Resonance theory
-
50%
b) VSEPR theory
-
50%
c)Molecular orbital theory
-
0%
d)Valance bond theory
Q.25.
MOst favorable conditions for ionic bonding are
-
0%
a) low charge on ion, large caution, large anion
-
50%
b) low charge on ions, large caution, large anion
-
0%
c)high charge on ions, large caution, small anion
-
50%
d)high charge on ions, small cation, large anion
Q.26.
If Z-axis is the molecular axis, then π-molecular orbitals are formed by the overlap of
-
50%
a)s + pz
-
0%
b) px + py
-
0%
c)pz + pz
-
50%
d)px + px
Explanation
Q.27.
Which of the following about H2O molecule is not true
-
50%
a) The molecule has dipole moment zero
-
0%
b) The molecule can act as a base
-
0%
c) The substance shows abnormally high boiling point in comparison to the hydrides of other elements of oxygen group
-
50%
d) The molecule has a bent shape
Q.28.
How many bonds ( bond order) does B2 have
-
67%
a)0
-
0%
b)1
-
33%
c)2
-
0%
d)3
Q.29.
The bond length of H2+, H2- and H2 are in the order
-
0%
a) H2+ > H2 > H2-
-
0%
b)H2 >H2+ > H2-
-
0%
c)H2- > H2 > H2+
-
100%
d)H2- > H2+> H2
Q.30.
If E is the energy of the combining atomic orbitals. E1 and E2 are the energies of the bonding and antibonding molecular orbitals formed, them
-
0%
a) E - E1 > E2 - E
-
0%
b)E - E1 < E2 - E
-
50%
c)E - E1=E2 - E
-
50%
d)Any one of these possible