Q.1.
Identify a molecule which does not exist. .... [NEET 2020]
-
12%
a) C2
-
8%
b) O2
-
73%
c) He2
-
7%
d) Li2
Q.2.
Which of the following diatomic molecular species has only π bonds according to Molecular Orbital Theory? [NEET 2019]
-
23%
a) O2
-
20%
b) N2
-
32%
c)C2
-
25%
d)Be2
Q.3.
Which one of the following elements is unable to form MF63- ion ? [NEET 2018]
-
42%
a) B
-
13%
b) Al
-
30%
c) Ga
-
15%
d) In
Q.4.
Consider the following species : CN+, CN-, NO and CN Which one of these will have the highest bond order ? [NEET 2018]
-
14%
a) CN+
-
47%
b) CN–
-
18%
c)NO
-
22%
d)CN
Explanation
Q.5.
Which of the following molecules represents the order of hybridisation sp2, sp2, sp, sp from left to right atoms ? [NEET 2018]
-
15%
a) CH2 = CH – CH = CH2
-
66%
b) CH2 = CH – C ≡ CH
-
15%
c) HC ≡ C – C≡ CH
-
5%
d) CH3 – CH = CH – CH3
Q.6.
Which of the following set of molecules will have zero dipole moment? [NEET 2020]
-
10%
a) Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene
-
60%
b) Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene
-
17%
c) Ammonia, beryllium difluoride, water, 1,4-dichlorobenzene
-
14%
d) Boron trifluoride, hydrogen fluoride, carbon dioxide, 1,3-dichlorobenzene
Explanation
Q.7.
Identify the incorrect statement related to PCl5 from the following: [NEET 2019]
-
22%
a) Three equatorial P–Cl bonds make an angle of 120° with each other
-
13%
b) Two axial P–Cl bonds make an angle of 180&dge with each other
-
20%
c) Axial P–Cl bonds are longer than equatorial P–Cl bonds
-
46%
d) PCl5 molecule is non-reactive
Explanation
Q.8.
The shape of gaseous SnCl2 is (kerala MEE 2000]
-
10%
a)Tetra hedral
-
21%
b) Linear
-
52%
c)Angular
-
17%
d)T-shaped
Q.9.
Sodium chloride is an ionic compound where as hydrogen chloride is mainly covalent because.. [ KCET 2002]
-
12%
a) sodium is less reactive
-
26%
b) Hydrogen is non-metal
-
12%
c) Hydrogen chloride is a gas
-
51%
d) Electronegativity difference in the case of Hydrogen and chloride is less than 2.1
Q.10.
The electronic configuration of metal M is 1s22s22p63sthe formula of its oxide will be ... [ MP PMT 1998]
-
9%
a) MO
-
42%
b) M2O
-
33%
c)M2O3
-
15%
d)MO2
Q.11.
Which of the following molecule is linear? [ MP PMT 2000]
-
16%
a) SO2
-
51%
b) NO2 +
-
24%
c)NO2 -
-
8%
d)SCl2
Q.12.
Among H2O, H2, H2Se and H2 Te, the one with highest boiling point is
-
48%
a)H2O because of hydrogen bonding
-
13%
b) H2Te because of higher molecular weight
-
32%
c)H2S because of hydrogen bonding
-
6%
d)H2Se because of lower molecular weight
Q.13.
Which of the following molecular species has unpaired electron(s)? [ IIT screening 2002]
-
6%
a) N2
-
21%
b) F2
-
48%
c)O2-
-
24%
d)O22-
Q.14.
The bond length in LiF will be ... [CPMT 2000]
-
45%
a) Less than that of NaF
-
21%
b) equal to that of KF
-
14%
c)more than that of KF
-
21%
d)equal to that of NaF
Q.15.
The compound MX4 is tetrahedral. the number of ∠XMX formed in such compound is .. [ DEC 2000]
-
20%
a)Three
-
43%
b) Four
-
7%
c)Five
-
30%
d)Six
Q.16.
Which of the following has zero dipole moment? [ MP PMT 2002]
-
7%
a) ClF
-
23%
b) PCl3
-
57%
c) SiF4
-
13%
d) CFCl3
Explanation
Q.17.
A lone pair of electron in an atom implies [ KCET 2002]
-
16%
a) a pair of valence electrons
-
3%
b) a pair of electrons
-
24%
c)a pair of electrons involved in bonding
-
58%
d)a pair of valence electron not involved in bonding
Explanation
Q.18.
Consider the following states. The common features of the molecules BF3, CO and NO are that I. All are Lewis acids II. all are gaseous in nature III. all contain unpaired electrons IV. all do not conform to the octet rule [SCRAE 2000]
-
17%
a) I and II
-
25%
b) III and IV
-
25%
c)I and III
-
33%
d)II and IV
Q.19.
Number of possible resonance structure of CO3-2 are ... [ MP PMT 2000]
-
7%
a)2
-
63%
b) 3
-
22%
c)6
-
7%
d)9
Q.20.
Fluorine molecule is formed by [ Kerals MEE 2001]
-
26%
a) the axial p-p orbital overlap
-
35%
b) the sideways p-p orbital overlap
-
30%
c) the s-s orbital overlap
-
9%
d) the overlap of s-p orbitals
Explanation
Q.21.
In NO3- ion, number of bond pairs and lone pairs of electrons on nitrogen atom are .. [ CBSE PMT 2002]
-
12%
a) 2, 2
-
33%
b) 3, 1
-
17%
c)1, 3
-
38%
d)4, 0
Q.22.
A molecule has seven bond pairs around the central atom, the shape associated with the molecule is
-
4%
a) heptagonal
-
4%
b) octahedral
-
33%
c) pentagonal pyramidal
-
58%
d) pentagonal bipyramidal
Explanation
Q.23.
Two ice cubes are pressed over each other until they unit to form one block. Which one of the following forces dominates for holding then together? [ kerala CEE 2000]
-
38%
a)Dipole -dipole interaction
-
26%
b) van der Waal's force
-
29%
c)Hydrogen bond formation
-
8%
d)Covalent attraction
Q.24.
Which of the following has pπ - dπ bonding? [ CBSE PMT 2002]
-
9%
a) NO3-
-
64%
b) SO32-
-
14%
c) BO33-
-
14%
d) CO32-
Q.25.
Covalent compounds have low melting point because [ KCET 2002]
-
25%
a) covalent molecules have definite shape
-
25%
b) covalent bond is weaker than ionic bond
-
20%
c)covalent bond is less exothermic
-
30%
d)covalent molecules are held by weak van der Waals force of attraction
Q.26.
N2 and O2 are converted into monoanions N2- , O2-respectively. Which of the following statement is wrong? .. [ CBSE PMT 1997]
-
0%
a) In N2-, N - N bond weakens
-
35%
b) In O2- bond order increases
-
53%
c) In O2- bond order decreases
-
12%
d) In ON2- become paramagnetic
Q.27.
Which of the following molecule will have unequal bond lengths? [ Kerala MEE 2000]
-
10%
a) NF3
-
24%
b) BF3
-
48%
c)PF5
-
19%
d)SF4
Q.28.
The type of forces between molecules of C6H6 are ... [ BHU 2000]
-
21%
a)Dipole -dipole interaction
-
50%
b) Dispersible forces
-
21%
c)H-bonding
-
8%
d)van der Waals force
Q.29.
Number of sigma bonds in P4O10 is ..[ AIEEE2002]
-
21%
a) 6
-
21%
b) 7
-
16%
c) 17
-
42%
d) 16
Q.30.
Molecule having non-zero dipole moment is ... [ kerala CEE 2000]
-
33%
a) H2O2
-
17%
b) CH4
-
33%
c)BF4-
-
17%
d)B2H2
Explanation
