Q.1.
Number of electrons that are paired in oxygen molecule is .. [ Kerala CEE 2000]
-
40%
a) 16
-
20%
b) 8
-
30%
c)14
-
10%
d)12
Explanation
Q.2.
the correct order of increasing C-O bond length of CO, CO32-, CO2 is ... [ IIT 1999]
-
17%
a)CO32- < CO2 < CO
-
25%
b) CO2 < CO32- < CO
-
17%
c)CO < CO32- < CO2
-
42%
d)CO < CO2 < CO32-
Q.3.
Sulphuric acid provides a simple example of ..
-
25%
a) co-ordinate bonds
-
62%
b) covalent compound
-
12%
c) covalent ion
-
0%
d) non-covalent ion
Explanation
Q.4.
The nodel plane in the π-bond of ethene is located in ... [ IIT screening 2002]
-
30%
a) the molecular plane
-
20%
b) a plane parallel to molecular plane
-
20%
c)a plane perpendicular to the molecular plane which bisects the carbon-carbon sigma bond at right angles
-
30%
d)a plane perpendicular to the molecular pane which contains the carbon carbon σ bond
Explanation
Q.5.
The value of electronegativity atom A and B are 1.20 and 4.0 respectively. the percentage of ionic character of A-B bond is [ DCE 2000]
-
11%
a) 50%
-
33%
b) 72.24%
-
44%
c)55.3%
-
11%
d)43.0%
Q.6.
Which of the following substance has the east ionic character? [ Kerala MEE 2000]
-
12%
a)FeCl2
-
38%
b) ZnCl2
-
25%
c)MgCl2
-
25%
d)HgCl2>2
Q.7.
In OF2, number of bond pairs and lone pairs of electrons are respectively [ DPMT 2002]
-
29%
a) 2, 6
-
57%
b) 2, 8
-
0%
c) 2, 10
-
14%
d) 2, 9
Q.8.
Chemical bond implies [ KCET 2002]
-
0%
a) repulsion
-
0%
b) attraction
-
100%
c)attraction and repulsion balanced at a particular distance
-
0%
d)attraction and repulsion
Explanation
Q.9.
Which of the following arrangements of molecules's is correct on the order of their dipole moment
-
25%
a) BF3 > NF3 > NH3
-
12%
b) NF3 > BF3 >NH3
-
12%
c)NH3 >BF3 > NF3
-
50%
d)NH3 > NF3 > BF3
Q.10.
The hybridization of atomic orbitals of nitrogen in NO2+, NO3- and NH4+ are .. [ iit screening test 2000)
-
0%
a)sp2, sp3 and sp2 respectively
-
38%
b) sp, sp2, and sp3 respectively
-
50%
c)sp2, sp and sp3 respectively
-
12%
d)sp2, sp3, and sp respectively
Explanation
Q.11.
The boiling point of p-nitrobenzene is higher than that of o-nitrobenzene because .. [ CBSE PMT 1994]
-
17%
a) NO2 group at p-position behaves in a different way from that at o-position
-
0%
b) intramolecular hydrogen bonding exists in p-nitophenol
-
67%
c) there is intermolecular hydrogen bonding in p-nitrophenol
-
17%
d) p-nitrophenol has higher molecular weight than o-nitrophenol
Q.12.
The correct order of decreasing polarisabile ions is
-
17%
a) Cl-, Br-, I-, F-
-
0%
b) F-, I-, Br-, Cl-
-
17%
c)F-, Cl-, Br-, I-
-
67%
d)I-, Br-, Cl-, F-
Q.13.
In which of the following hydrogen bonding is not possible .. [ AMU 1997]
-
20%
a) NH3, NH3
-
40%
b) NH3, NCH4
-
0%
c)H2O, CH3OCH3
-
40%
d)CH3OH, CH3OCH3
Q.14.
The following molecule is not linear in shape .. [ CPMT 1996]
-
17%
a)HgCl2
-
17%
b) Hg2Cl2
-
17%
c)CO2
-
50%
d)SnCl2
Q.15.
Which of the following has least covalent P-H bond? [ CPMT 1996]
-
0%
a) PH3
-
20%
b) P2H6
-
0%
c) P2H5
-
80%
d) PH6+
Q.16.
The sulphate of a metal has the formula M2(SO3)The formula of its phosphate will be ... [ MPPMT 1995]
-
17%
a) M(HPO4)2
-
50%
b) M3(PO4)2
-
17%
c)M2(PO4)3
-
17%
d)MPO4
Q.17.
Bond order is a concept in the molecular orbital theory. It depends on the number of electrons in the bonding and antibonding orbitals. Which of the following statements is true about it? [ AIIMS 1994]
-
17%
a) Bond order cannot be negative
-
0%
b) Bond order have always an integral value
-
67%
c)Bond ordercan assumes any value, positive or negative integral or fractional, including zero
-
17%
d)Bond orderis non -zero quantity
Q.18.
For two ionic solids, CaO and KI. Identify the wrong statement among the following .. [ CBSE PMT 1997]
-
17%
a)Lattice energy CaO is much higher than that of KI
-
33%
b) KI is soluble in benzene
-
33%
c)CaO has higher melting point
-
17%
d)KI has lower melting point
Q.19.
The structure and hybridization of Si(CH3)4 is ... [ CBSE PMT 1996]
-
0%
a) bent, sp
-
0%
b) trigonal, sp2
-
14%
c)octahedral, sp3d
-
86%
d)tetrahedral, sp3
Q.20.
Which of the following species has lowest ionization potential
-
0%
a) O
-
0%
b) O2
-
57%
c) O2+
-
43%
d) O2-
Q.21.
Molecule having dipole moment is ... [ AFMC 1994]
-
17%
a) 2,2-dimethylpropane
-
33%
b) trans-2-pentene
-
0%
c)neopentane
-
50%
d)2,2,3,3-tetranethylbutane
Q.22.
Bonding in Ferric chloride is ... [ Pb CET 1997]
-
33%
a) Covalent
-
33%
b) Ionic
-
17%
c)CO-ordinate
-
17%
d)None of the above
Explanation
Q.23.
Polarization power of cation increases when .... [ AMU 1997]
-
20%
a)Charge on the cation increases
-
20%
b) size of the cation increases
-
20%
c)charge on the cation decreases
-
40%
d)has no relation to its size or charge
Q.24.
Which of the following ion does not have bond order of 2.5? [ Raj.PMT 1998]
-
80%
a) O2-
-
0%
b) O2+
-
20%
c) N2+
-
0%
d) N2-
Q.25.
2 and O2 are converted into monocations, N2+ and O2+ respectively. Which of the following is wrong? [ CBSE PMT 1997]
-
20%
a) In N2+, N_N bond weakens
-
40%
b) In O2- bond order increases
-
20%
c)In O2+ paramagnetism decreases
-
20%
d)N2+ becomes diamagnetic
Q.26.
Which of the following is the correct electron dot structure of N2O molecule .... [MP PET 1996] (I) Formal charge helps us which structure is most correct. Where choosing the best structure, based on following rules (a) Smaller formal charge are more favourable. (b) More electronegative atoms should have negative formal charge. (II) In option (b) Formal charge of centre Nitrogen is +1 and formal charge of oxygen is -1 Following the eule that more electro-negative atome should have negative formal charge. Oxygen is more electronegative atom and has negative charge.
-
33%
a)
-
0%
b)
-
33%
c)
-
33%
d)
Q.27.
Which of the following hydrogen halide have lowest boiling point? [ AIIMS 1994]
-
25%
a)HF
-
75%
b) HCl
-
0%
c)HBr
-
0%
d)HI
Q.28.
Average distance of single covalent bond of carbon and oxygen is ... [ Pb CET 1998]
-
40%
a) 1.34 A°
-
20%
b) 1.54 A°
-
0%
c) 1.77 A°
-
40%
d) 1.91 A°
Q.29.
On the basis of ionic potential, the tendency to form covalent bond in a group ... [ BHU 1994]
-
43%
a) Increases
-
14%
b) Decreases
-
14%
c)remains unchanged
-
29%
d)shows erratic change
Q.30.
Which of the following molecular orbitals has two nodal planes ... [ Haryana CEET 1996]
-
0%
a) σ2s
-
0%
b) π2py
-
50%
c)π*2py
-
50%
d)σ*2px