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NEET Chemistry MCQ
Molecular Bonding Mcq Neet Chemistry
Quiz 8
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Q.1
he molecule MLx is planar with six pairs of electrons around M in the valence shell. the value of x is
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a) 6
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b) 2
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c) 4
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d) 3
Explanation
Since the molecule have six pairs of electron, shape should have been octahedral, but it is given that shape is square planar, it should have two loan pairs and 4 bonded pairs. Therefore, value of x is MLx is 4 Answer: (c)
Q.2
Which of the following has highest dipole moment
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a)H2O
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b) CO2
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c)CCl4
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d)BF3
Explanation
H2O has bent shape and hence finite dipole moment while all other molecules have zero dipole momentAnswer: (a)
Q.3
Pair of species having similar shape is
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a) PCl3 , NH3
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b) CF4, SF4
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c)PbCl2, CO2
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d)PF5, IF5
Explanation
CF4 have sp3 hybridization while SF4 has sp3d hybridizationPbCl2 is ionic while CO2 has sp hybridizationPF5 has sp3d hybridization while IF5 has sp3d2 hybridization PCl3 , NH3 have sp3 hybridization and loan pair of electron , thus have same pyramidal shapeAnswer: (a)
Q.4
Which of the following compound is non polar
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a) CH3Cl
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b) CH2Cl2
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c) CHCl3
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d) CCl4
Explanation
In CCl4 , have regular tetrahedral geometry, the four dipole moments cancel each other hence is non polar. While all other options have C-Cl polar bond/s hence have net dipole moment Answer:(d)
Q.5
In which of the following species the angle around the central atom is exactly equal to 109°28'
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a) SF4
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b) NH3
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c) NH4+
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d) None of above
Explanation
Answer: (c)
Q.6
hape of ClF3 molecule is
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a)Triangular planar
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b) Pyramidal
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c)T shape
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d)Trigonal bipyramidal
Explanation
ClF3 have 5 electron pairs ( 2 lone pairs and 3 bond pairs). Repulsion are minimum when it has T shapeAnswer: (c)
Q.7
Which of the following gaseous molecules is polar
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a) CS2
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b) BF3
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c)SnCl2
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d)PbCl4
Explanation
CS2 have linear geometry,BF3 have triangularplanarPbCl4 have regular tetra hedral geometry. Hence all these molecules have zero dipole moment. SnC2 is bent molecule have sp2 hybridization. It has, therefore, a finite dipole moment and hence it is polar moleculeAnswer: (c)
Q.8
Which of the following has smallest bond length
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a) O2
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b) N2
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c)Cl2
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d)HCl
Explanation
From given options only N2 have triple bonds hence lowest bond length Answer:(b)
Q.9
A σ bond molecule MX3 is T-shaped. the number of non-bonding pairs of electrons is
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a) 0
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b) 2
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c) 1
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d) can be predicted only if aromatic number of M is known
Explanation
MX3 has three bond pairs. It can have T shape only if there is two lone pair electron Answer: (b)
Q.10
Which of the following have zero dipole moment
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a)Benzene
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b) Naphthalene
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c)P-Dichlorobenzene
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d)All the these
Explanation
Benzene molecule is symmetrical planar molecule. It has 6C-H bonds or 6 dipole moments, which cancel outone another and thus as all individual dipoles cancel out, the net dipole moment is zero Naphthalene is a two-ring system in which each ring has the same aromaticity as benzene, a neutral aromatic ring. Since C-H bonds are both non-polar and symmetrically distributed, naphthalene has zero dipole moment In p-dichlorobenzene, the dipole moments of the two C-Cl being equal and opposite cancel out each other and hence dipole moment is zero Answer: (d)
Q.11
The molecule that does not posses a permanent dipole moment is
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a) NF3
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b) BF3
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c)CH2 Cl2
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d)NO2
Explanation
Answer: (b)
Q.12
Which one of the following is a compound most likely to have a dipole moment
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a) CS2
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b) CCl2F2
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c)SO3
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d)SnCl4
Explanation
In CCl2F2 , two C - Cl bond does not cancel resultant of C-F bonds hence the molecule has a finite dipole moment Answer:(b)
Q.13
Which of the following accounts for the bond angle of 104.5° around O in water molecule?
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a) lp-bp repulsions
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b) Lower ionization energy
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c) Higher electron affinity of oxygen
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d) small size of O and H atoms
Explanation
Answer: (a)
Q.14
The shape of SF4 molecule is
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a)square planar
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b) trigonal bipyramidal
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c)Pyramidal
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d)Distorted tetrahedron / see saw
Explanation
SF4 has 5 electron pairs ( one lone pair and 4 bonded pairs. Repulsions are minimum when the lone pair occupies one of the equatorial position. The resulting shape is distorted tetrahedron/ see sawAnswer: (d)
Q.15
Which of the following bonds have lower bond energy
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a) C - C
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b) N - N
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c)H - H
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d)O - O
Explanation
Due to inter electronic repulsion between the small O atoms, O - O bond is the weakestAnswer: (d)
Q.16
Which of the following combination is not allowed in the LCAO method for the formation of MO ( consider the Z-axis as the molecular axis)?
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a) s + pz
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b) s + px
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c)px + px
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d)pz + pz
Explanation
overlap of a and px is not possible Answer:(b)
Q.17
A molecule XY2 contains two σ bond and two π bond and one lone pair of electron in the valence shell of X. The arrangement of lon pair as well as bond pairs is
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a) square pyramidal
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b) linear
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c)trigonal planar
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d)unpredictable
Explanation
The valence shell of X has two σ-bonds and one lone pair of electrons. Therefore, it has planar trigonal geometry. It may be mentioned here that bond pairs involved in the formation of π -bonds are not considered while deciding the geometry of the molecule Answer:(c)
Q.18
A molecule has seven bond pairs around the central atom, the shape associated with the molecule is
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a) heptagonal
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b) octahedral
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c) pentagonal pyramidal
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d) pentagonal bipyramidal
Explanation
Answer: (d)
Q.19
A molecule has seven bond pairs around the central atom, the shape associated with the molecule is
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a) heptagonal
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b) octahedral
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c) pentagonal pyramidal
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d) pentagonal bipyramidal
Explanation
Answer: (d)
Q.20
Which of the following molecules has non-zero dipole moment
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a) PCl5
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b) BF3
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c)SO2
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d)CO2
Explanation
SO2 being bent molecule have non-zero dipole momentAnswer: (c)
Q.21
Which of the following has a largest bond angle
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a) H2O
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b) F2O
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c)Cl2O
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d)H2S
Explanation
Answer:(c)
Q.22
The correct order of the bond angles is
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a) NH3 > H2O > PH3 > H2S
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b) NH3 > PH3 > H2O > H2S
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c) NH3 > H2S > PH3 >H2O
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d) PH3 > H2S > NH3 > H2O
Explanation
The bond angles depends on the electro negativity of the central atom . greater the electronegativity, greater the angle. N has one loan pair, while O have two loan pairs also electro negativity of O is more than N P have one loan pair while S have two loan pairs. Electro negativity of S is more than P electro negativity decreases O > N > S > PThus option a is correct Answer: (a)
Q.23
The correct increasing bond angle among BF3, PF3 and ClF3 follows the order
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a) BF3 < PF3 < ClF3
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b) PF3 < BF3 < ClF3
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c)ClF3 < PF3 < BF3
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d)ClF3=PF3=BF3
Explanation
BF3 is sp2 hybridize thus angle is nearly 120PF3 is sp3 hybridized thus bond angle nearly 90 to 109°ClF3 is sp3d hybridized. It has T shape angle around 90°Answer: (c)
Q.24
Which of the following molecules have highest dipole moment?
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a) BF3
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b) NH3
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c)NF3
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d)B2H6
Explanation
BF3 being triangular planar has zero dipole momentB2H6 is a dimmer of triangular planar molecule (BH3), there fore have zero dipole moment. NH3 and NF3 on the other hand have pyramidal structures and thus have dipole moments. In NH3 the dipole moment of the three N_H bonds reinforce the dipole moment due to lone pair of electrons but in NF3 the dipole moment of the three F-F bonds oppose the dipole moment due to loan pair of electrons. As a result dipole moment of NH3 is more than NF3Answer: (b)
Q.25
The correct order of bond angle is
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a) NO2- > NO2+ > NO2
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b)NO2+ > NO2- > NO2
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c)NO2 > NO2+ >NO2-
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d)NO2+ > NO2 > NO2-
Explanation
Bond angle depends on loan pairs more the loan pairs lesser is the bond angle N in NO2+ have no loan pairsNO2 have one loan pairNO2- have two loan pair Answer:(d)
Q.26
Which out of the following structures is expected to have three bond pairs and one lone pair
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a) Tetra hedral
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b) Octa hedral
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c) Trigonal planar
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d) Pyramidal
Explanation
Answer: (d)
Q.27
Which of the following molecules has a higher dipole moment
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a)CO2
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b) CCl4
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c)NH3
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d)BF3
Explanation
NH3 being pyramidal has finite dipole moment while all other molecules being symmetrical have zero dipole momentAnswer: (c)
Q.28
Which of the following set contains species having same angle around the central atom
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a) SF4, CH4, NH4
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b) NF3, BCl3, NH3
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c)BF3, NF3, AlCl3
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d)BF3, BCl3, BBr3
Explanation
Central atom in B in all molecules in option (d) are sp2 hybridized hence will have same angleAnswer: (d)
Q.29
The bond angles of NH3, NH4+ and NH2- are in order
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a) NH2- > NH3 > NH4+
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b)NH4+ > NH3 > NH2-
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c)NH3 > NH2- > NH4+
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d)NH3 > NH4+ >NH2-
Explanation
option 'b' is correct since bond angle depends on loan pairs NH4+ have no loan pair NH3 have one loan pair NH2- have two loan pairs Answer:(b)
Q.30
he bond angle if H2O molecule is less than that of NH>3 molecule because
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a) The hybridisation of O in H2O and N in NH3 is different
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b) The atomic radii of N and O are different
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c) There is one lone pair of electrons on O and two loan pairs of electrons on O
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d) There are two lone pairs of electrons on O and one loan pair of electrons on N
Explanation
Answer: (d)
0 h : 0 m : 1 s
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