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NEET Chemistry MCQ
Molecular Bonding Mcq Neet Chemistry
Quiz 3
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Q.1
Among the following compounds the one that is polar and has the central atom with sp2 hybridization is ...{IIT 1997]
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a)H2CO3
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b) SiF4
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c)BF3
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d)HClO2
Explanation
HClO2 and BF3 have sp2 hybridization, but due to symmetric arrangement of F around B net dipole moment is zero Answer: (a)
Q.2
Which concept best explains the fact that o-nitrophenol is more volatile than p-nitrophenol? [ AIIMS 1994]
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a) resonance
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b) hyperconjugation
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c) hydrogen bonding
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d) steric hindrance
Explanation
there is intermolecular hydrogen bonding in p-nitrophenol while in o-nitrophenol there is intra hydrogen bonding Answer: (c)
Q.3
The metallic luster exhibited by sodium is explained by .. [ Pb. CET 1998]
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a) diffusion of sodium ions
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b) excitation of free protons
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c)oscillation of loose electrons
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d)existence of body centered cubic lattice
Explanation
Answer:(c)
Q.4
The high density of water compared to ice due to .. [ CBSE PMT 1997]
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a) H -bonding interactions
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b) dipole -dipole interactions
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c)dipole-induced dipole interactions
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d)induced dipole induced dipole interaction
Explanation
Answer: (a)
Q.5
According to VSEPR theory, the most probable shape of the molecule having 4 electrons pair in the outer shell of the central atom is ... [ MP PET 1996]
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a)Linear
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b) Tetrahedral
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c)Hexahedral
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d)Octahedral
Explanation
Answer: (b)
Q.6
In PO43-, the formal charge on each oxygen atom and P-O bond order respectively are .. [ CBSE 1998]
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a) -0.75 , 0.6
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b)-0.75 , 1.0
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c) -0.75, 1.25
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d) -3.0, 1.25
Explanation
The structure of PO43- is Here three unit negative charge is shared by four oxygen atoms ∴ formal charge=-3/4 = 0.75 Five bon pairs are shared between four P-P bond ∴ B.O of P -O=5/4=1.25Answer: (c)
Q.7
According to Fajan's rule covalent bonding is favoured between ... [ BHU 1994]
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a) small cation and large anion
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b) small cation and large anion
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c)large cation and large anion
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d)large cation and small anion
Explanation
According to Fajan's rules of polarization, more the size of anion, more easily it will be polarized and hence, the compound will be more covalent. Less the size of cation, more will be ita polarizing power and hence compound will be more covalent. Answer:(a)
Q.8
Which of the following has the highest dipole moment? [ CBSE PMT 1997]
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a) AsH3
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b) SbH3
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c)PH3
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d)NH3
Explanation
For group VA element elctronegativity decreases from N to Bp All the options have same structure but electro negativity is highest for N Answer: (d)
Q.9
The maximum number of water molecules that one water molecule can bond through hydrogen bond is ... [ IIT 1992]
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a)2
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b) 4
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c)6
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d)8
Explanation
Answer: (b)
Q.10
Which of the following statement is not correct [ AIIMS 1982]
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a) Hybridization is the mixing of atomic orbitals prior to their combining into molecular orbitals
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b) sp2 hybrid orbitals are formed from two p-atomic orbitals and one s-orbital
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c) dsp2 hybrid orbitals are all at 90° to one another
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d) s2sp3 hybrid orbitals are directed towards the corners of a regular octahedron
Explanation
Answer: (a)
Q.11
CO2 is isostructural with which of the following? [ MP PMT 1995]
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a) HgCl2
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b) H2O
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c)SnCl2
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d)NO2
Explanation
CO2 is sp hybridized, hence linear, while HgCl2 is also linear molecule hence isostructural Answer:(a)
Q.12
The structure of PF5 molecule is ... [ AFMC 1995]
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a) Tetrahedral
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b) Square planar
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c)Trigonal bipyramidal
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d)pentagonal bipyramidal
Explanation
PF5 have 40 valence electron Now 40 ÷ 8=5(Q) + 0(R) , thus hybridization is sp3d hence trigonal bipyramidalAnswer: (c)
Q.13
An element (X) forms compounds of the formula XCl3, X2O5 and Ca3X2 but does not form XCl5 Which of the following is the element X .. [ MP PMT 1998]
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a)B
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b) Al
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c)N
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d)P
Explanation
Nitrogen can form NCl3, N2O5, Ca3N2 Nitrogen due to absence of empty d-orbitals canot extend its covalency by more than 3 and hence do not form NCl5 Due to its sma;; size and high electronegativity it can accept 3 e- to form N3-3N2) In above question covalency of x in xCl3 is 3 option'c' is correct as Nitrogen do not have d orbital to form XCl5Answer: (c)
Q.14
Density of ice is hess than that of water because of .... [ BHU 1994]
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a) Extensive hydrogen bonding
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b) Crystal modification of ice
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c)Open porous structure of ice due to hydrogen bonding
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d)different physical states of these
Explanation
Answer: (c)
Q.15
A metallic bond is .. [ Pb CET 1998]
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a)ionic
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b) Polar covalent
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c)Non-polar covalent
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d)Electrostatic in nature
Explanation
Metallic Bond: The force of attaction between positively charged metallic ion and negatively charged sea of delocalised electrons is called metallic bond. It is stronger than ionic and covalent bond. Answer: (d)
Q.16
mong the following orbital bond angle is minimum between [ CBSE PMT 1994]
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a) sp3
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b) px and py
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c) H - O - H in water
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d) sp bonds
Explanation
angle between px and py is 90° and is minimum Answer: (b)
Q.17
The bond order of NO molecule is ... [ MP PMET 1996]
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a) 1.5
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b) 2.0
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c)2.5
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d)3.0
Explanation
Electron configuration of NO according MO theory is Number of electrons in NO=15 <16 thus order of O2 is followedσ1s2, σ*1s2σ2s2, σ*2s2σ2pz2, π2px2=π2py2, π*2px1 Here Nb=10 and Na=5 ∴ B.O.=(10-5)/2=2.5 Answer:(c)
Q.18
The number of sigma( σ) bonds in 1-butene is ... [ MP PMT 1995]
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a) 8
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b) 10
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c)11
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d)12
Explanation
There is one pi-bond between two carbons rest of the bonds are σ Total σ bonds are 11 and one pi bondAnswer: (c)
Q.19
The geometry of ClO3- ion according to Valance shell electron pair repulsion theory will be{MP PRET 1998]
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a)Planar triangular
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b) Pyramidal
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c)Tetrahedral
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d)Square planar
Explanation
ClO3- have sp3 hybridizationAnswer: (c)
Q.20
NH3 has higher boiling point than expected because ... [ Pb CET 1985]
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a) It forms NH4OH with water
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b) It has strong intermolecular hydrogen bonds
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c) It has intramolecular hydrogen bonds
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d) Its density decreases on freezing
Explanation
Answer: (b)
Q.21
What happens if CCl4 is treated with AgNO3 ... [ DPMT 1994]
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a)A white ppt. of AgCl will form
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b) NO2 will evolved
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c)CCl4 will dissolved in AgNO3
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d)Nothing will happen
Explanation
Carbon tetrachloride does not ionize in the solution because it is a covalent. Carbon will not give Cl ion in the solution. No exchage between CCl4 and AgNO3 and AgNO3 ( Silver nitrate), no reaction take place. CCl4 is a covalent compound, therefore, it does not ionize to give Cl-. Hence it does not give white ppt of AgCl when treated with AgNO3 solution. There is no reaction to evolve NO2. CCl4 will forma separate layer as it is immiscible with water. Answer:(d)
Q.22
The type of bonding in HCl molecule is [ AIIMS 1992]
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a) Pure covalent
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b) Polar covalent
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c)Highly polar
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d)Hydrogen bonding
Explanation
The covalent bond in HCl Hδ+ - Clδ- is polary in nature. This is due to the appreciable electronegativivity difference of hydrogen and chlorine. Electronegativity difference is less than 1.5 thus it is polar covalent. Answer: (b)
Q.23
hich of the following has the least bond angle? [ Pb CET 1991]
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a)BeF2
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b) H2O
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c)NH3
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d)CH4
Explanation
BF2 has linear geometry bond angle is 180° NH3, H2O, CH4 has tetrahedral geometry. Lone pair -lone pair > lone-pair - bond pair > bond-bond pair CH4 bond angle is 109°28' no lone pair NH3 has 1 lone pair, H2O has two lone pair. Bond angle in H2O reduces from 109°28' to 104°5' as repulsion between two lone-pair reduces the bond-angle Answer: (b)
Q.24
Which statement is not correct? [ CBSE PMT 1990]
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a) A sigma bond is weaker than a π-bond
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b) A sigma bond is stronger than a π bond
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c) A double bond is stronger than a single bond
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d) A double bond is shorter than a single bond
Explanation
Answer: (a)
Q.25
Among the following, which compound will show the highest lattice energy? [ CBSE PMT 1993]
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a) KF
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b)NaF
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c)CsF
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d)RbF
Explanation
All options are fluorides and cation have same chargeAs cation size decreases there is a increases in lattice energyThus NaF has highest lattice energy Answer:(b)
Q.26
Which of the following has the shortest carbon carbon bond length? [ CBSE PMT 1991]
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a) Benzene
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b) Ethene
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c)Ethyne
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d)Ethane
Explanation
Bond length ∝ (1/bond-order/ No. of bonds) Ethane have one bond Ethene have two bonds Ethynene have three bonds Benzene have three σ bonds and have three π bonds Bond length increase = Ethane > Ethene > Benzene > Ethyne. Ethyne have triple bond thus lowest bond lengthAnswer: (c)
Q.27
The octet rule is not valid for the molecule ... [ JIPMER 1994]
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a)CO2
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b) H2O
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c)O2
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d)CO
Explanation
Answer: (d)
Q.28
The M.O. configuration of He2+1 will be
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a) σ1s2, σ*1s2,σ2s2, σ*2s1
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b) σ1s2, σ*1s2,σ2s2, σ*2s2
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c) σ1s2, σ*1s2,σ2s2
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d) σ1s2, σ*1s1
Explanation
Answer: (d)
Q.29
Ethanol and methoxymethane boils at a lower temperature because it has ... [ DEC 1994]
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a) low density
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b) no hydrogen bonding
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c)molecular association
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d)oxygen atom attached to two methyl groups
Explanation
Answer:(b)
Q.30
In which of the following, the central atom does not use sp3 hybrid orbitals in its bonding? [ MLNR 1992]
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a) BeF3-
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b) OH3+
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c)NH2-
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d)NF3
Explanation
BeF3- have sp2 hybridization. while remaining have sp3 hybridizationAnswer: (a)
0 h : 0 m : 1 s
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