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