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NEET Chemistry MCQ
Molecular Bonding Mcq Neet Chemistry
Quiz 4
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Q.1
What type of hybridization is possible in square planar molecules? [ Pb CET 1991]
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a)sp3d
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b) dsp3
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c)dsp2
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d)sp3d2
Explanation
Answer: (c)
Q.2
NH3 has a much higher boiling point that PH3 because ... [ MLNR 1994]
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a) NH3 has larger molecular weight
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b) NH3 undergoes umbrella inversion
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c) NH3 forms hydrogen bond
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d) NH3 contains ionic bonds whereas PH3 contains covalent bonds
Explanation
Answer: (c)
Q.3
The complex ion [Co(NH3)6]3+ is formed by sp3d2 hybridization. Hence the ion should posses ... [ CBSE PMT 1990]
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a) Octahedral geometry
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b) tetrahedral geometry
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c)square planar geometry
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d)tetragonal geometry
Explanation
Answer:(a)
Q.4
Which of the following is the correct order of interactions? [ CBSE PMT 1993]
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a) Covalent < hydrogen bonding < van der Waals < dipole - dipole
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b) van der Waals < hydrogen bonding < dipole - dipole < Covalent
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c)van der Waals
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d)dipole - dipole < van der Waals
Explanation
Answer: (b)
Q.5
Which type of bond is not present in HNO2 molecule .. [ Roorkee Screen Test 1991]
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a)Covalent
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b) Co-ordinate
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c)Ionic
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d)Ionic as well as co-ordinate
Explanation
Answer: (d)
Q.6
Which of the following will have low heat of fusion? [ DEC 1994]
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a) covalent solid
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b) metallic solid
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c)an ionic solid
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d)a molecular solid
Explanation
Answer:(d)
Q.7
In allene structure three carbon atoms are joined by ... [ BHYU 1993]
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a) three sigma bonds and three pi-bonds
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b) Two sigma bonds and one pi-bond
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c)Two sigma bonds and two pi bonds
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d)three pi bonds only
Explanation
formula for allene CH2 =C=CH2 Thus Two sigma bonds and two pi bonds Answer: (c)
Q.8
Intermolecular forces in solid hydrogen are ... [ Pb CET 1991]
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a)van der Waal's forces
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b) Covalent forces
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c)Hydrogen bonds
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d)None of these
Explanation
Answer: (a)
Q.9
Among LiCl, BeCl2, BCl3 and CCl4 the covalent bond character follows the order ... [ CBSE PMT 1990]
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a) LiCl < BeCl2 > BCl3 > CCl4
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b) LiCl > BeCl2 < BCl3 < CCl4
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c) LiCl < BeCl2 < BCl3 < CCl4
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d) LiCl > BeCl2 >BCl3 > CCl4
Explanation
Fajan's rule: 1) Larger anion + smaller cation ⇒ more covalent 2) higher chrge /oxidative state ⇒ more covalent LiCl < BeCl2 < BCl3 < CCl4 More than size of the cation more the covalent nature Answer: (c)
Q.10
The central atom assumes sp3 hybridization in ... [ MLNR 1994]
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a) PCl3
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b) SO3
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c)BF3
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d)NO3-
Explanation
Except PCl3 all other are sp2Answer: (a)
Q.11
Strongest hydrogen bond is shown by ... [ CBSE PMT 1992]
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a)Water
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b) Ammonia
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c)Hydrogen fluoride
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d)Hydrogen sulphide
Explanation
Fluorine has maximum electronegativity hence strongest H bondAnswer: (c)
Q.12
Mark the incorrect statement in the following ... [ CBSE PMT 1994]
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a) the bond order in the species O2, O2+ and O2- decreases as O2+ > O2 > O2-
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b)The bond energy in a diamatic molecule always increases when an electron in lost
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c)Electrons in antibonding M.O> contribute to repulsion between two atoms
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d)With increase in bond order, bond length decreases and bond strength increases
Explanation
B.O of O2 = 2 O2+ = 2.5 O2- = 1.5 When diatomic molecule lost e-, then its bond order may increases or increase Antibonding MO have higher energy due to this it create repulsion between the atom B.O. ∝ Bond strength ∝ 1/Bond length Answer:(b)
Q.13
Linear combination of two hybridized orbitals belonging to two atoms and each having one electron leads to a .. [ CBSE PMT 1990]
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a) Sigma bond
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b) Double bond
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c) Co-ordinate covalent bond
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d) pi- bond
Explanation
Answer: (a)
Q.14
Elements have electronegativities 1.2 and 3.0 bond formed between them would be ...{CPMT 1994]
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a) Ionic
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b) Covalent
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c)Co-ordinate
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d)Metallic
Explanation
Since electronegativity difference is more than 1.5 bonding is ionic Answer:(a)
Q.15
Which of the following does not exhibit paramagnetism? [ BHU 1993]
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a) NO
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b) NO2
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c)ClO2
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d)ClO2-
Explanation
Number of electrons : NO=7 +8=15 NO2=7 + 8+ 8=23ClO2=17 + 8 + 8=33 ClO2-=17 +8 + 8 +1=34 Only ClO2- have even number of electrons and hence is not paramagnetic but is dimagneticAnswer: (d)
Q.16
The element having electron configuration 1s2, 2s2, 2p6, 3s2, 3p3 is [ CPMT 1991]
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a)Only trivalent
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b) Only tetravalent
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c)Only pentavalent
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d)tetravalent and pentavalent
Explanation
Answer: (d)
Q.17
Which of the following properties would suggest that a compound under investigation is covalent? [ pb. CET 1990]
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a) It conducts electricity on melting
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b) It is a non-electrolyte
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c) It has a high melting point
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d) It is a compound of metal and non metal
Explanation
Answer: (b)
Q.18
The dielectric constant of H2O isthe electrostatic force of attraction between Na+ and Cl- will be .... [ CBSE PMT 1994]
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a) reduced to 1/40 in water than in air
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b) reduced to 1/80 in water than in air
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c)will be increased to 80 in water than in air
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d)will remain unchanged
Explanation
According to Coulomb’s Law force of attraction between two charges is inversily proportional to dielectric constant Answer:(b)
Q.19
Two lone pairs of electrons and two bonded pairs of electrons are present in ... [ CPMT 1993]
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a) NH3
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b) BF3
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c)H2O
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d)CO2
Explanation
Answer: (c)
Q.20
Which one of the following is paramagnetic? [ CPMT 1992]
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a)NO+
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b) O2-
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c)CN-
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d)CO
Explanation
Number of electrons in:NO+=7+8-1=14O2-=8+8+1=17CN-=6+7+1=14CO=6+8=14Only O2- have odd electrons hence paramagneticAnswer: (b)
Q.21
Which one shows maximum hydrogen bonding? [ CBSE PMT 1990]
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a) H2O
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b) H2Se
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c) H2S
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d) HF
Explanation
One H2O molecule form four hydrogen bonds with neighboring molecules Answer: (a)
Q.22
Which of the following structures is expected to have three bond pairs and one loan pair? [ JIPMER 1994]
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a) tetrahedral
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b) trigonal planar
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c)pyramidal
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d)octahedral
Explanation
Answer:(c)
Q.23
The percentage of s-character in the hybrid orbitals sp, sp2 and sp3 follows the pattern... [ AIIMS 1993]
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a) sp3 > sp2 > sp
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b) sp > sp2 > sp3
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c)sp=sp2 > sp3
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d)sp=sp2=sp3
Explanation
Answer: (b)
Q.24
In compound X, all the bond angles are exactly 109°28'. X is
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a)Chloromethane
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b) Carbon tetrachloride
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c)Iodoform
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d)Chloroform
Explanation
All are tetrahedral and sp3 hybridization 109°28' angle is possible only when all atom around the central atom should be same, because it provides perfect symmetry In other the geometry is little distorted due to different size of atom attached to carbon. CCl4 Answer: (b)
Q.25
According to molecular orbital theory, O2+ possesses ... [ Pb CET 1989]
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a) Bond order of 2.5
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b) Three unpaired electrons
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c) Diamagnetic character
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d) Stability lower than O2
Explanation
Answer: (a)
Q.26
Which of the following has a net dipole moment? [ harayana CEET 1994]
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a) CCl4
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b) BF3
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c)NH3
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d)CO2
Explanation
∴ bond angle in H2S and H2O is smaller compared to NH3 and CH4 Bond angle and electronegativity of central atom. Su;phur is less electronegative than oxygen. ∴ Bond angle of H2S is less than H2O NH3 has a pyramidal shape hence have net dipole moment. Other option molecule have symmetric arrangement dipole moment is zero Answer:(c)
Q.27
The distribution of electrons in the molecular orbital of O2 molecule is as follows... [ ISM 1994] σ1s2,σ*1s2σ2s2,σ*2s2σ2pz2
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a) π2px2 ,π2py2π*2px2 ,π*2py0
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b)π2px2 ,π2py2π*2px1 ,π*2py1
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c)π2px2 ,π2py1π*2px1 ,π*2py2
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d)π2px2 ,π2py0π*2px2 ,π*2py2
Explanation
Answer: (b)
Q.28
Both sp2 and sp3 hybrid carbon are present in which one of the following compounds? [ CPMT 1992]
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a)CH3 - CH3
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b) CH2=CH2
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c)CH Ξ CH
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d)CH3 -CH=CH - CH3
Explanation
double bond due to sp2 hybridization and single bond due to sp3Answer: (d)
Q.29
in an anion HCOO- the two carbon-oxygen bonds are found to be of equal length. What is the reason for it? [ AIEEE 2003]
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a) Electronic orbitals of carbon atom are hybridize
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b) The C=O bond is weaker than C-O bond
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c) The anion HCOO- has two resonating structures
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d) The anion is obtained by removal of proton from the acid molecule
Explanation
Answer: (c)
Q.30
hich as minimum bond angle? [ Pb CET 1986]
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a) H2O
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b) H2S
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c)NH3
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d)CH4
Explanation
All have tetrahedral geometry presence of lone pair reduces the bond-angle. * According to VSEPR repulsion order lone pair-loan pair > lone pair pair > bond pair-bond pair &thre4 More the electro negative central ion more the bond angle Sulphur have low electro negativity hence minimum bond angle., also CH4 is sp3 hybridized with out any lone pair bond angle is greater than H2S Answer:(a)
0 h : 0 m : 1 s
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