NEET NCERT Chemical bonding objective questions,solutions ,mcqs,pdfs
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Chemical Bond and Molecular Structure Mock Tests-4

QUESTION NO:1
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Which of the following pairs of molecules is not non polar covalent bond?

[A] (a)H2and O2
[B] (b) HCI and H2
[C] (c) N2 and F2
[D] (d) Cl2 and O2



QUESTION NO:2
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Identify the molecule which has polar covalent bond.

[A] (a) H2
[B] (b) F2
[C] (c) HF
[D] (d) O2



QUESTION NO:3
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Dipole moment defined as the

[A] (a) product of the magnitude of the charge and the distance between the centres of positive and positive charge.
[B] (b) product of the magnitude of the charge and the distance between the centres of negative and negative charge.
[C] (c) product of the magnitude of the charge and the distance between the centres of positive and negative charge.
[D] (d) product of the magnitude of the resistance and the distance between the neutral nuclei



QUESTION NO:4
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What is the unit of dipole moment?

[A] (a) Debye
[B] (b) Ohm
[C] (c) Coulomb
[D] (d) Metre



QUESTION NO:5
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One Debye is equal to

[A] (a) 6.17 x10-31 Cm
[B] (b) 3.33 x 10-30 Cm
[C] (c) 9.1 x 10-31 Cm
[D] (d) 2.1 x 10-29 Cm



QUESTION NO:6
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Some statements regarding dipole moment are given below. Identity the correct statements.
(I) Dipole moment is usually expressed In Debye unit.
(II) It is a scalar quantity.
(Ill) It is the product of the magnitude of the charge and the distance between the centres of positive and negative charge.

[A] (a) I and II
[B] (b) II and III
[C] (c) I and III
[D] (d) I II and III



QUESTION NO:7
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In case of polyatomic molecules, the dipole moment depends upon the

[A] (a) Individual dipole moments of bonds and on the spatial arrangement of the various bonds in the molecule.
[B] (b) individual dipole moments of bonds only.
[C] (c) spatial arrangement of the various bonds in the molecule only.
[D] (d) neither individual dipole moments of bonds nor on the spatial arrangement of the various bonds in the molecule.



QUESTION NO:8
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Net dipole moment (μ) of water molecule (H2O) is 85 D. Its values in Cm is equal to

[A] (a) 1.35×10-30Cm
[B] (b) 8.33×10-30 Cm
[C] (c) 6.17×10-30Cm
[D] (d) 5.21×10-30 Cm



QUESTION NO:9
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The dipole moment in case of Be F2 is zero, this is because

[A] (a) the two unequal bond dipoles point in same directions and cancel the effect of each other.
[B] (b) the two unequal bond dipoles point in opposite directions and cancel the effect of each other.
[C] (c) the two equal bond dipoles point in same directions and cancel the effect of each other.
[D] (d) the two equal bond dipoles point in opposite directions and cancel the of each other.



QUESTION NO:10
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Which of the following statements is incorrect with respect to BF3 molecule?

[A] (a) It is a tetra atomic molecule
[B] (b) The dipole moment is zero.
[C] (c) The EVF bonds are oriented of an angle of 90° to one another.
[D] (d) The three bond moments give a net sum of zero as the resultant of any two is equal and opposite to the third.



QUESTION NO:11
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The sum of lone pair of electrons present in the molecule of NH3and NF3 is/are

[A] (a) one
[B] (b) two
[C] (c) three
[D] (d) zero



QUESTION NO:12
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Select the Correct Statement

[A] (a) Dipole moment of NH3 is greater than that of NF3-
[B] (b) Dipole moment of Be F2 is 6.17×10-30Cm.
[C] (c) Dipole moment of BF3 is 3.33 x10-30Cm
[D] (d) Dipole moment of HI is greater than that of HF.



QUESTION NO:13
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Select the correct option in which first molecule has higher dipole moment than the second.

[A] (a) CO2, H2O
[B] (b) NF3, NH3
[C] (c) HCl, HBr
[D] (d)CCl4,CHCl3



QUESTION NO:14
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Which of the following molecule has non-zero dipole moment?

[A] (a) CO2
[B] (b) BF3
[C] (c) NF3
[D] (d) CCl4



QUESTION NO:15
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Which of the following statements is/are correct?

[A] (a) All the covalent bonds have some partial Ionic character.
[B] (b) The ionic bonds also have partial covalent character.
[C] (c) both (a) and (b) are correct.
[D] (d) None of these are correct.



QUESTION NO:16
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Some statements are given below. Identify the correct statement(s).
(I) The smaller the size of the cation and the larger the size of the anion. the greater the covalent character of an Ionic bond.
(II) The greater the charge on the catkin, the greater the covalent character of the Ionic bond.
(III) The cation polarises the anion. pulling the electronic charge toward itself and thereby increasing the electronic charge between the two ionic bonds.

[A] (a) I only
[B] (b) II only
[C] (c) I and II
[D] (d) I, II and III



QUESTION NO:17
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According to Fajans’ rule

[A] (a) the smaller the size of the cation and the larger the size of the anion, the greater the covalent character of an ionic bond.
[B] (b) the bigger the size of the cation and the smaller the size of the anion. the greater the covalent character of an ionic bond.
[C] (c) the smaller the size of the cation and the smaller the size of the anion. the smaller the covalent character of an ionic bond.
[D] (d) the larger the size of the cation and the larger the size of the anion. the greater the covalent character of an ionic bond.



QUESTION NO:18
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Polarity in a molecule and hence the dipole moment depends primarily on electro negativity of the constituent atoms arid shape of a molecule.
Which of the following has the highest dipole moment?

[A] (a) CO2
[B] (b) HI
[C] (c) H2O
[D] (d) SO2