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Chemical Bonding
1.
Nature of the bond formed between two elements depends on the (a) Oxidation potential
10.
(b) Electronegativity
(c) Ionization potential (d) Electron affinity 2.
Two elements X and Y have following electronic configurations
X 1s 2 , 2 s 2 2 p 6 , 3 s 2 3 p 6 , 4 s 2
4.
6.
(c) NaCl 11.
(c) H 3 O
(d) NH 4
(d) XY 5
12.
expected to be
(c) In melted state
(a) 3.46 D
[CPMT 1991]
(d) None of these
From the following which compound on heating readily sublimes (a) NaCl (b) MgCl 2
CO 32
The dipole moment of chlorobenzene is 1.73 D. The dipole moment of p -dichlorobenzene is
Electricity do not pass through ionic compounds (a) In solution (b) In solid state
13.
(b) 0.00 D
(c) 1.73 D (d) 1.00 D Polarization of electrons in acrolein may be written as [IIT 1988]
(d) AlCl 3
Which one in the following contains ionic as well as covalent bond [IIT 1979; CPMT 1983; DPMT 1983]
(a) C H 2 CH C H O (b) C H 2 CH CH O
(a) CH 4
(b) H 2
(c) C H 2 C H CH O (d) C H 2 CH CH O
(c) KCN
(d) KCl
14.
The solution of sugar in water contains
[Roorkee 2000]
(a) Free atoms (b) Free molecules
(b) CH 2 Cl 2 CH 3 Cl CHCl 3 CCl 4
(c) Free ions
(c) CH 3 Cl CH 2 Cl 2 CHCl 3 CCl 4
(d) Free atoms and free molecules In which of the following reactions, there is no change in the valency [NCERT 1974; CPMT 1971, 78] (a) 4 KClO 3 3 KClO 4 KCl
(d) CH 2 Cl 2 CHCl 3 CH 3 Cl CCl 4
(d) 2BaO O2 2BaO 2
15.
(c) CaF2
[BHU 1981]
Which of the following bond has the most polar character [DPMT 1982; CBSE PMT 1992; CPMT 1999]
(d) BF3
Sodium chloride is an ionic compound whereas hydrogen chloride is a gas because [KCET 2002] (a) Sodium is reactive (b) Covalent bond is weaker than ionic bond (c) Hydrogen chloride is a gas
The electronegativity of C, H, O, N and S are 2.5, 2.1, 3.5, 3.0 and 2.5 respectively. Which of the following bond is most polar (a) O H (b) S H (c) N H (d) C H
16.
The octet rule is not followed in (a) F2 (b) NaF
The order of dipole moments of the following molecules is (a) CHCl 3 CH 2 Cl 2 CH 3 Cl CCl 4
(c) BaO 2 H 2 SO 4 BaSO 4 H 2 O2
9.
[RPMT 2002]
(b)
(b) SO 2 2H 2 S 2H 2 O 3S
8.
Co-ordinate bond is absent in (a) BH 4
[NCERT 1972; MP PET 2000]
7.
(d) Cl 2
formed by combination of X and Y is [BHU 1990] (a) XY 2 (b) X 5 Y 2
(c) BaCl 2 5.
(d) Covalent bond is stronger than ionic bond Which one of the following molecules has a coordinate bond [CPMT 1988, 94] (a) NH 4 Cl (b) AlCl 3
Y 1s 2 , 2 s 2 2 p 6 , 3 s 2 3 p 5 . The expected compound
(c) X 2 Y 5 3.
and
149
17.
(a) C O (b) C Br (c) C S (d) C F The geometry of H 2 S and its dipole moment are[IIT 1999] (a) Angular and non-zero (b) Angular and zero (c) Linear and non-zero (d) Linear and zero
[
150 Chemical Bonding 18.
How many and bonds are there in the molecule of tetracyanoethylene N C CN CC N C CN
26.
(b) Five and nine
(c) Nine and seven (d) Five and eight 19.
The shape of H 3 O ion is [EAMCET 1993; CPMT
20.
(b) Angular
(c) Trigonal planar
(d) Triangular pyramidal
27.
(b) Cl 2 (d) I 2
What bond order does
28.
In the process,
(b) sp 2
3
(d) dsp 2
The number and type of bonds between two carbon atoms in CaC 2 are
29.
(b) 2 (d) 1/2 O 2
(c) One sigma ( ) and one and a half pi ( ) bonds
30.
(b) Antibonding -orbital
(c) 2 p z orbital
(d) 2 p x orbital
The maximum number of hydrogen bonds formed by a water molecule in ice is (a) 4
(b) 3
(c) 2
(d) 1
Hydrogen bonding is not present in [AIIMS 1998; MP PET/PMT 1998]
(a) Glycerine
Which of the following resonating structures of [Roorkee Qualifying 1998] N 2 O is the most contributing (a) N N O
(b) N N O
(c) N N O
(d) N N O
The hybridization of atomic orbitals of nitrogen in ,
, and NH
4
are
(b) Water (c) Hydrogen sulphide (d) Hydrogen fluoride
31.
The bonds in K 4 [Fe (CN )6 ] are [IIT Screening (a) All ionic2000]
(b) All covalent
(a) sp, sp 3 and sp 2 respectively
(c) Ionic and covalent
(b) sp, sp 2 and sp 3 respectively (c) sp 2 , sp and sp 3 respectively 2
(d) sp , sp 24.
3
and sp respectively
The molecule having one unpaired electron is [IIT 1985; MP PMT 1989]
(a) NO (c) CN 25.
e the electron lost is
(a) Bonding -orbital
(d) One sigma ( ) bond
NO 3
O 22
[IIT 1996] [MP PET 1993; AFMC 2002;UPSEAT 1999, 2001, 02]
(b) One sigma ( ) and two pi ( ) bonds
NO 2
[Pb. PMT 2001]
from
(a) One sigma ( ) and one pi ( ) bonds
23.
have
[Orissa JEE 2002]
(a) sp
22.
O 22
(c) 1
DPMT 1990]
21.
Which of the following halogens has the highest bond energy [CPMT 1988]
(a) 3
The hybridization in sulphur dioxide is[IIT 1986;
(c) sp
(d) Square planar
(c) Br 2
2001]
(a) Linear
(b) Pyramidal
(c) Tetrahedral
(a) F2
[NCERT 1980; MP PMT 1986, 95;Orissa JEE 1997]
(a) Nine and nine
(a) Planar triangle
The geometry
of ClO 3 ,
(d) Ionic, covalent and coordinate covalent 32.
In which of the following ionic, covalent and coordinate bonds are present (a) Water (b) Ammonia
(b) CO
(c) Sodium cyanide
(d) O 2
(d) Potassium bromide
according to valence shell
electron pair repulsion (VSEPR) theory will be [KCET 1996; MP PET 1997]
[
Chemical Bonding
151
(SET -3) 1.
2.
3.
(b) If the two elements have similar electronegativities,the bond between them will be covalent, while a large difference in electronegativities leads to an ionic bond. (a) From electronic configuration valencies of X and Y are + 2 and –1 respectively so formula of compound is XY 2 .
4.
(b) Ionic compounds can’t pass electricity in solid state because they don’t have mobile ion in solid state. (d) AlCl 3 sublimes readily on heating.
5.
(c) Structure of KCN is [K (C N )] .
6.
(b) Sugar is an organic compound which is covalently bonded so in water it remains as free molecules.
16. 17.
value of dipole moment. N N C C
18.
7. 8. 9.
10.
6
2 6
electrons so it is electron deficient compound. (b) NaCl is a ionic compound because it consists of more elelctronegativity difference compare to HCl. (a) NH 4 Cl has a coordinate bond besides covalent H | and ionic bonds H N | H
11. 12. 13. 14.
|
(b) O C O has covalent bonds only. (b) Due to symmetry dipole moment of p-dichloro benzene is zero. (d) (d) CCl 4 has zero dipole moment because of
electronegativity then 15.
(a) More the difference in electronegativity of atoms. Bond between them will be more polar.
N C
20. 21.
(b) In
22.
C bonds. (a) In N 2 O molecule N N O structure is most
23.
contributed. (b) The shape of NO 2 , NO 3 and NH 4 are linear
C
***
Ca two carbons are joined with 1 and 2
trigonal planar and tetrahedral respectively. Thus the hybridization of atomic orbitals of nitrogen in these species are sp, sp 2 and sp 3 24.
respectively. (a) NO has one unpaired electron with Nitrogen. .. : N :: O : . ..
..
O Cl O
25.
(b)
26.
O (b) Bond energy of
|
Cl 2 is highest among all
halogen molecule. Bond energies of F2 , Cl2 , Br2 , I2 are 37, 58, 46 and 36 Kcal mol 1 27.
respectively. (c) O 22 have bond order one 1 2 [10 8 ] 1 . 2 2 (b) Electron lost from antibonding orbital. (a) In ice each water molecule forms four hydrogen bond through which each water
B.O.
CH 2 Cl 2 . But CH 2 Cl 2
has greater dipole moment than CHCl 3 .
triangular pyramidal due to lone pair on oxygen. (c) SO 2 molecule has sp 2 hybridisation.
symmetric tetrahedral structure. CH 3 Cl has slightly higher dipole moment which is equal to 1.86D. Now has less CH 3 Cl
9 and 9 bonds. (d) H 3 O has sp 3 hybridization and its shape is
O
C C
19.
H Cl
(c) In the reaction BaO 2 H 2 SO 4 BaSO 4 H 2 O valency is not changing. (d) BF3 does not have octet, it has only six
(a) N C
..
2
(d) C F bond has the most polar character due to difference of their electronegativity. (a) H 2 S has angular geometry and have some
28. 29.
152 Chemical Bonding molecule is tetrahedrally attached with other water molecule. H O H
H
H
O
O H
H
H
H
H
H O
O H
H
H O
O H
H
H O
O
H 30. 31.
H
(c) Hydrogen bonding is present in molecules which have F, O, or N atoms. (d) Structure of K 4 [Fe(CN )6 ] is 4
32.
CN C N C N 4K Fe C N C N CN (c) Sodium cyanide contain ionic, covalent and coordinate bond.
1.
Nature of the bond formed between two elements depends on the (a) Oxidation potential
10.
(b) Electronegativity
(c) Ionization potential (d) Electron affinity 2.
Two elements X and Y have following electronic configurations
X 1s 2 , 2 s 2 2 p 6 , 3 s 2 3 p 6 , 4 s 2
4.
6.
(c) NaCl 11.
(c) H 3 O
(d) NH 4
(d) XY 5
12.
expected to be
(c) In melted state
(a) 3.46 D
[CPMT 1991]
(d) None of these
From the following which compound on heating readily sublimes (a) NaCl (b) MgCl 2
CO 32
The dipole moment of chlorobenzene is 1.73 D. The dipole moment of p -dichlorobenzene is
Electricity do not pass through ionic compounds (a) In solution (b) In solid state
13.
(b) 0.00 D
(c) 1.73 D (d) 1.00 D Polarization of electrons in acrolein may be written as [IIT 1988]
(d) AlCl 3
Which one in the following contains ionic as well as covalent bond [IIT 1979; CPMT 1983; DPMT 1983]
(a) C H 2 CH C H O (b) C H 2 CH CH O
(a) CH 4
(b) H 2
(c) C H 2 C H CH O (d) C H 2 CH CH O
(c) KCN
(d) KCl
14.
The solution of sugar in water contains
[Roorkee 2000]
(a) Free atoms (b) Free molecules
(b) CH 2 Cl 2 CH 3 Cl CHCl 3 CCl 4
(c) Free ions
(c) CH 3 Cl CH 2 Cl 2 CHCl 3 CCl 4
(d) Free atoms and free molecules In which of the following reactions, there is no change in the valency [NCERT 1974; CPMT 1971, 78] (a) 4 KClO 3 3 KClO 4 KCl
(d) CH 2 Cl 2 CHCl 3 CH 3 Cl CCl 4
(d) 2BaO O2 2BaO 2
15.
(c) CaF2
[BHU 1981]
Which of the following bond has the most polar character [DPMT 1982; CBSE PMT 1992; CPMT 1999]
(d) BF3
Sodium chloride is an ionic compound whereas hydrogen chloride is a gas because [KCET 2002] (a) Sodium is reactive (b) Covalent bond is weaker than ionic bond (c) Hydrogen chloride is a gas
The electronegativity of C, H, O, N and S are 2.5, 2.1, 3.5, 3.0 and 2.5 respectively. Which of the following bond is most polar (a) O H (b) S H (c) N H (d) C H
16.
The octet rule is not followed in (a) F2 (b) NaF
The order of dipole moments of the following molecules is (a) CHCl 3 CH 2 Cl 2 CH 3 Cl CCl 4
(c) BaO 2 H 2 SO 4 BaSO 4 H 2 O2
9.
[RPMT 2002]
(b)
(b) SO 2 2H 2 S 2H 2 O 3S
8.
Co-ordinate bond is absent in (a) BH 4
[NCERT 1972; MP PET 2000]
7.
(d) Cl 2
formed by combination of X and Y is [BHU 1990] (a) XY 2 (b) X 5 Y 2
(c) BaCl 2 5.
(d) Covalent bond is stronger than ionic bond Which one of the following molecules has a coordinate bond [CPMT 1988, 94] (a) NH 4 Cl (b) AlCl 3
Y 1s 2 , 2 s 2 2 p 6 , 3 s 2 3 p 5 . The expected compound
(c) X 2 Y 5 3.
and
149
17.
(a) C O (b) C Br (c) C S (d) C F The geometry of H 2 S and its dipole moment are[IIT 1999] (a) Angular and non-zero (b) Angular and zero (c) Linear and non-zero (d) Linear and zero
[
150 Chemical Bonding 18.
How many and bonds are there in the molecule of tetracyanoethylene N C CN CC N C CN
26.
(b) Five and nine
(c) Nine and seven (d) Five and eight 19.
The shape of H 3 O ion is [EAMCET 1993; CPMT
20.
(b) Angular
(c) Trigonal planar
(d) Triangular pyramidal
27.
(b) Cl 2 (d) I 2
What bond order does
28.
In the process,
(b) sp 2
3
(d) dsp 2
The number and type of bonds between two carbon atoms in CaC 2 are
29.
(b) 2 (d) 1/2 O 2
(c) One sigma ( ) and one and a half pi ( ) bonds
30.
(b) Antibonding -orbital
(c) 2 p z orbital
(d) 2 p x orbital
The maximum number of hydrogen bonds formed by a water molecule in ice is (a) 4
(b) 3
(c) 2
(d) 1
Hydrogen bonding is not present in [AIIMS 1998; MP PET/PMT 1998]
(a) Glycerine
Which of the following resonating structures of [Roorkee Qualifying 1998] N 2 O is the most contributing (a) N N O
(b) N N O
(c) N N O
(d) N N O
The hybridization of atomic orbitals of nitrogen in ,
, and NH
4
are
(b) Water (c) Hydrogen sulphide (d) Hydrogen fluoride
31.
The bonds in K 4 [Fe (CN )6 ] are [IIT Screening (a) All ionic2000]
(b) All covalent
(a) sp, sp 3 and sp 2 respectively
(c) Ionic and covalent
(b) sp, sp 2 and sp 3 respectively (c) sp 2 , sp and sp 3 respectively 2
(d) sp , sp 24.
3
and sp respectively
The molecule having one unpaired electron is [IIT 1985; MP PMT 1989]
(a) NO (c) CN 25.
e the electron lost is
(a) Bonding -orbital
(d) One sigma ( ) bond
NO 3
O 22
[IIT 1996] [MP PET 1993; AFMC 2002;UPSEAT 1999, 2001, 02]
(b) One sigma ( ) and two pi ( ) bonds
NO 2
[Pb. PMT 2001]
from
(a) One sigma ( ) and one pi ( ) bonds
23.
have
[Orissa JEE 2002]
(a) sp
22.
O 22
(c) 1
DPMT 1990]
21.
Which of the following halogens has the highest bond energy [CPMT 1988]
(a) 3
The hybridization in sulphur dioxide is[IIT 1986;
(c) sp
(d) Square planar
(c) Br 2
2001]
(a) Linear
(b) Pyramidal
(c) Tetrahedral
(a) F2
[NCERT 1980; MP PMT 1986, 95;Orissa JEE 1997]
(a) Nine and nine
(a) Planar triangle
The geometry
of ClO 3 ,
(d) Ionic, covalent and coordinate covalent 32.
In which of the following ionic, covalent and coordinate bonds are present (a) Water (b) Ammonia
(b) CO
(c) Sodium cyanide
(d) O 2
(d) Potassium bromide
according to valence shell
electron pair repulsion (VSEPR) theory will be [KCET 1996; MP PET 1997]
[
Chemical Bonding
151
(SET -3) 1.
2.
3.
(b) If the two elements have similar electronegativities,the bond between them will be covalent, while a large difference in electronegativities leads to an ionic bond. (a) From electronic configuration valencies of X and Y are + 2 and –1 respectively so formula of compound is XY 2 .
4.
(b) Ionic compounds can’t pass electricity in solid state because they don’t have mobile ion in solid state. (d) AlCl 3 sublimes readily on heating.
5.
(c) Structure of KCN is [K (C N )] .
6.
(b) Sugar is an organic compound which is covalently bonded so in water it remains as free molecules.
16. 17.
value of dipole moment. N N C C
18.
7. 8. 9.
10.
6
2 6
electrons so it is electron deficient compound. (b) NaCl is a ionic compound because it consists of more elelctronegativity difference compare to HCl. (a) NH 4 Cl has a coordinate bond besides covalent H | and ionic bonds H N | H
11. 12. 13. 14.
|
(b) O C O has covalent bonds only. (b) Due to symmetry dipole moment of p-dichloro benzene is zero. (d) (d) CCl 4 has zero dipole moment because of
electronegativity then 15.
(a) More the difference in electronegativity of atoms. Bond between them will be more polar.
N C
20. 21.
(b) In
22.
C bonds. (a) In N 2 O molecule N N O structure is most
23.
contributed. (b) The shape of NO 2 , NO 3 and NH 4 are linear
C
***
Ca two carbons are joined with 1 and 2
trigonal planar and tetrahedral respectively. Thus the hybridization of atomic orbitals of nitrogen in these species are sp, sp 2 and sp 3 24.
respectively. (a) NO has one unpaired electron with Nitrogen. .. : N :: O : . ..
..
O Cl O
25.
(b)
26.
O (b) Bond energy of
|
Cl 2 is highest among all
halogen molecule. Bond energies of F2 , Cl2 , Br2 , I2 are 37, 58, 46 and 36 Kcal mol 1 27.
respectively. (c) O 22 have bond order one 1 2 [10 8 ] 1 . 2 2 (b) Electron lost from antibonding orbital. (a) In ice each water molecule forms four hydrogen bond through which each water
B.O.
CH 2 Cl 2 . But CH 2 Cl 2
has greater dipole moment than CHCl 3 .
triangular pyramidal due to lone pair on oxygen. (c) SO 2 molecule has sp 2 hybridisation.
symmetric tetrahedral structure. CH 3 Cl has slightly higher dipole moment which is equal to 1.86D. Now has less CH 3 Cl
9 and 9 bonds. (d) H 3 O has sp 3 hybridization and its shape is
O
C C
19.
H Cl
(c) In the reaction BaO 2 H 2 SO 4 BaSO 4 H 2 O valency is not changing. (d) BF3 does not have octet, it has only six
(a) N C
..
2
(d) C F bond has the most polar character due to difference of their electronegativity. (a) H 2 S has angular geometry and have some
28. 29.
152 Chemical Bonding molecule is tetrahedrally attached with other water molecule. H O H
H
H
O
O H
H
H
H
H
H O
O H
H
H O
O H
H
H O
O
H 30. 31.
H
(c) Hydrogen bonding is present in molecules which have F, O, or N atoms. (d) Structure of K 4 [Fe(CN )6 ] is 4
32.
CN C N C N 4K Fe C N C N CN (c) Sodium cyanide contain ionic, covalent and coordinate bond.
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