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NEET Chemistry MCQ
Molecular Bonding Mcq Neet Chemistry
Quiz 5
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Q.1
Which of the following have permanent dipole moment? [ AIIEEE 2005]
0%
a)BF3
0%
b) SiF4
0%
c)SF4
0%
d)XeF4
Explanation
SF4 have sp3d have lone pair, molecule is not symmetricAnswer: (c)
Q.2
Which of the following halogens has the highest bond energy [ IIT 1981]
0%
a) F2
0%
b) Cl2
0%
c)Br2
0%
d)I2
Explanation
Bond energy : Yhe energy requred to break the bond. for group 17 down the group bond length increase and bond is weak Iodine required less energy to break the bond ∴F - F has strong bond, but due to small in size repulsion create between them. So bond length increase. so as compare to chlorine, Flourine required less energy to break the bond. Cl-Cl bond energy high. lower the size of the atom higher is the bond energy but incase of F2 bond energy is lower than chlorine because of repulsion between lone pairs Answer: (b)
Q.3
Which of the following molecules is not linear? [ Pb CET 1989]
0%
a) CO2
0%
b) SO2
0%
c) C2H2
0%
d) MgCl2
Explanation
SO2 have sp2 hence bent structure, remaining molecules have sp hybridization thus linear Answer: (b)
Q.4
In which one of the following molecules can the central tom said to adopt sp2 hybridization? [ CBSE PMT 1989]
0%
a) BeF2
0%
b) BF3
0%
c)C2H2
0%
d)NH3
Explanation
Number of valence electrons in BF3 are 3+21=24Now 24 ÷ 8=3∴ sp2 hybridization Answer:(b)
Q.5
Which of the following is diamagnetic ... [ CPMT 1988]
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a) O2
0%
b) O2+
0%
c)O2-
0%
d)O22-
Explanation
All electrons in O22- are paired thus diamagneticAnswer: (d)
Q.6
Dipole moment is shown by ... [ IIT 1986]
0%
a)1,4 dichlorobenzene
0%
b) cis-1,2-dichloroethene
0%
c)trans-1,2,-dichloroethene
0%
d)trans-2,3,-dichloro-2-butene
Explanation
1,4 dichlorobenzene have symmetry thus no dipole momenttrans-1,2,-dichloroethene and trans-2,3,-dichloro-2-butene have symmetry thus no dipole moment cis-1,2-dichloroethene have both the chlorine atoms are at the same side of axis hence non zero dipole momentAnswer: (c)
Q.7
Of the following which one has lowest boiling point? [ CBSE PMT 1989]
0%
a) AsH3
0%
b) SbH3
0%
c) PH3
0%
d) NH3
Explanation
In case of hydrides greater the size of central atom higher the boiling point. In NH3 due to hydrogen bonding have greatest boiling point. P have lowest size Answer: (c)
Q.8
Which of the following has a linear structure? [ IIT 1986]
0%
a) CCl4
0%
b) CO2
0%
c)C2H2
0%
d)C2H4
Explanation
in option (c) there is a sp hybridization , linear structure Answer:(c)
Q.9
Which one of the following has the regular tetrahedaral structure? [ AIEEE2004]
0%
a) XeF4
0%
b) [Ni(CN)4]2-
0%
c)BF4-
0%
d)SF4
Explanation
Valence electrons in BF4-=3 +4 ×7 +1=32Now 32 ÷ 8=4 sp3 hybridization, regular tetra hedral shapeAnswer: (c)
Q.10
Which of the following compounds have linear structure [ IIT 1986]
0%
a)CCl4
0%
b) SO2
0%
c)C2H2
0%
d)C2H4
Explanation
C2H2 has sp-hybridization thus linearAnswer: (c)
Q.11
H2O has a net dipole moment while BeF2 has zero dipole moment because .... [ CBSE PMT 1989]
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a) H2O molecule is linear while BeF2 is bent
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b) BeF2 molecule is linear while H2O is bent
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c) Fluorine has more electronegativity than oxygen
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d) Beryllium has more electronegativity than Oxygen
Explanation
BeF2 has sp hybridization hence linear, thus zero dipole moment due to symmetry. While H2O has sp3 hybridization, hence bent molecule, have finite dipole moment Answer: (b)
Q.12
The angle between the overlapping of one s-orbital and one p-orbital is .... [ CBSE PMT 1988]
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a) 180°
0%
b) 120°
0%
c)109°28'
0%
d)120° 60'
Explanation
over lapping between s and p can occur along the axis of molecule thus 180° Answer:(a)
Q.13
Among the following compounds the one that is polar and has the central atom sp2 hybridization .. [ IIT 1997]
0%
a) H2CO3
0%
b) SiF4
0%
c)BF3
0%
d)HClO2
Explanation
BF3 has sp2 hybridization but have regular trigonal structure resultant dipole moment is zeroHClO2has sp3 hybridization Hybridization state= 0.5*(No. Of valence electrons)-3*(No. Of atoms other than central and hydrogen atom) For H2/sub>CO3 central atom is C From formula hybridization = 0.5×[1×2 + 1×4 + 3×6 ) - 3( 3)] =0.5×[2+4+18] - 9 =0.5(24) - 9 =12 - 9 = 3 = sp2 Answer: (d)
Q.14
CO2 is not iso structural with ... [ IIT 1984]
0%
a)HgCl2
0%
b) SnCl2
0%
c)C2H2
0%
d)ZnCl2
Explanation
Carbon dioxide has the formula CO2 and at the centre of this linear molecule is a carbon atom joined by two pairs of double-bonds to the oxygen atoms, i.e O=C=O. 1) While SnCl2; Sn is sp2 hybridized with a bond angle of 120o and hence the molecule is angular. 2) The Mercuric chloride (HgCl2) molecular geometry of is Linear. As there is no lone pairs with Hg and the number of bonding pairs. Therefore, the hybridization is SP hybridization and the structure is Linear. 3) C2H2 have sp hybridization and is linearBased on VSEPR Theory (Valence Shell Electron Pair Repulsion Theory) the electron clouds on the atoms around the C will repel each other. As a result they will be pushed apart giving the molecule a linear molecular geometry or shape. Answer: (c)
Q.15
Molecular orbital theory was given by ..[ BHU 1987]
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a) Mulliken
0%
b) Moseley
0%
c) Werner
0%
d) Kossel
Explanation
Answer: (a)
Q.16
The hybrid orbital used by chlorine atom in ClO2- ... [ IIT 1992]
0%
a) sp3
0%
b) sp2
0%
c)sp
0%
d)None of these
Explanation
Valance electrons in ClO2-=7+12+1=20now 20 ÷8=2(Q1) +4(R1)and R1 ÷2=4 ÷ 2=2(Q2 + 0 (R2Q1 + Q2 + R2=2+2+0=4∴ Hybridization is sp2 Answer:(a)
Q.17
The maximum number of 90° angle between bond pair-bond pair of electrons is observe in ... [ AIEEE 2004]
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a) dsp2 hybridization
0%
b) sp3d2 -hybridization
0%
c)dsp2 -hybridization
0%
d)sp3d - hybridization
Explanation
sp3d2, octahedral geometry all bond angles are90°Answer: (b)
Q.18
if a molecule MX3 has zero dipole moment the sigma bonding orbitals used by M( atomic number < 21) are ... [ IIT 1981]
0%
a)Pure p
0%
b) sp hybrid
0%
c)sp2 hybrid
0%
d)sp3
Explanation
for momentum to be zero, for MX3 structure must be sp2 hybridAnswer: (c)
Q.19
In a homonuclear molecule which of the following set of orbitals are degenerate? [ AIIMS 1989]
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a) σ2s and σ1s
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b) π2px and π2py
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c) π2px and σ2pz
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d) σ2pz and π*2px
Explanation
degenerate orbitals have same energy Answer: (b)
Q.20
The bond angle between H - O - H in ice is closest to ... [ CPMT 1989]
0%
a) 109°28'
0%
b) 60°
0%
c)90°
0%
d)105°
Explanation
geometry = ½( valence electron of central atom + no. of monovalent atom) geometry = ½(6+2) = 4 Tetrahedral structure sp3 hybridization Bond angle = 109&dig28' Answer:(d)
Q.21
Equilateral shape has ... [ CBSE PMT 1988]
0%
a) sp hybridization
0%
b) sp2 hybridization
0%
c)sp3 hybridization
0%
d)sp3d hybridization
Explanation
Equilateral or trigonal planar shape have sp2 hybridizationAnswer: (b)
Q.22
Amongst the following molecules the one with the largest distance between the two adjacent carbon atoms is ... [ IIT 1979]
0%
a)Ethane
0%
b) Ethene
0%
c)Ethyne
0%
d)Benzene
Explanation
C2H6 ⇒ H3C - CH3 C2H4 ⇒ H2C = CH2 C2H2 ⇒ HC ≡ CH C - C ⇒ 154 pm C = C ⇒ 134 pm C ≡ C ⇒ 120pm Benzene ⇒ 139 B.O ∝ 1/Bond length more the numbers of bond, shorter is the bond lengthAnswer: (a)
Q.23
In co-ordinate valency valency [ CPMT 1989]
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a) electrons are equally shared by the atoms
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b) electrons of one atom are shared by two atoms
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c) hydrogen bond is formed
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d) one of the above
Explanation
Answer: (b)
Q.24
Which of the following molecule does not have a linear arrangement of atom? [ CBSE PMT 1989]
0%
a)H2S
0%
b) C2H2.
0%
c)BeH2
0%
d)CO2
Explanation
only H2S have sp3 hybridization. hence bend shape. remaining molecules have sp hybridization Answer:(a)
Q.25
Which has a covalent bond? [ AFMCE 1988]
0%
a) Na2S
0%
b) SnCl4
0%
c)NaH
0%
d)MgCl2
Explanation
Fajan's rule: 1) Larger anion + smaller cation ⇒ more covalent 2) higher chrge /oxidative state ⇒ more covalentAccording to Fajan rule, higher the charge on the cation, more covalent character because of more polarising power. Sn have +4 charge Answer: (b)
Q.26
The correct order of bond angles ( small first in H2S, NH2, BF3 and SiH4 is [ AIEEE 2004]
0%
a)H2S < SiH4 < NH2 < BF3
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b) H2S < NH2 < BF3 < SiH4
0%
c) H2S < NH2 < SiH4< BF3
0%
d) NH2 < H2S < SiH4< BF3
Explanation
H2S , NH3 and SiH4 have sp3 hybridization but S have two lone pairs thus H2 have less angle than NH3 , In SiH3 there is no lone pair thus bond angle is greater than NH3BF3 is sp2 have highest bond angle because of absence of lone pairs. bond angle is 120≥ Answer: (c)
Q.27
the hybridization of carbon involved in C-C single bond in CH Ξ C - CH=CH2 is ... [ IIT 1991]
0%
a) sp3 - sp2
0%
b) sp3 - sp3
0%
c) sp - sp2
0%
d) sp - sp3
Explanation
sp - sp2 Answer: (c)
Q.28
The compound in which C uses sp3 hybrid orbitals for bonding formation ... [ IIT 1989]
0%
a) HCOOH
0%
b) (NH2)2CO
0%
c)(CH3)3COH
0%
d)CH2 + C=O
Explanation
All CH3 in (CH3)3COH C is sp3 hybridized Answer:(c)
Q.29
The boiling point is not affected due to hydrogen bonding in
0%
a) Water
0%
b) ammonia
0%
c)methyl alcohol
0%
d)hydrogen chloride
Explanation
HCl does not under go H bondingAnswer: (d)
Q.30
The boiling points of methanol, water and dimethyl ether are respectively 65°C, 100°C and 34.5°C. Which of the following best explains these wide variations in b.p
0%
a) The molecular mass increases from water(18) to methanol(32) to diethyl ether(74)
0%
b)The extent of H-bonding decreases from water to methanol while it is absent in ether
0%
c)The extent of H-bonding decreases from ether to methanol to water
0%
d)The density of water is 1.00 g ml-, methanol 0.7914 g ml-1 and that of diethyl ether is 07137 g ml-1
Explanation
Answer:(b)
0 h : 0 m : 1 s
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