Question # 1

Which bond has more ionic characters in it.

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C - F

N - F

O - F

F - F

Which element has highest ionization potential

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Li

Na

K

Rb

The bond angle in NH3 molecule is

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109.5^o

107.5^o

104.5^o

106^o

VSEPR theory was proposed by

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Nyholn and Gillespie

Kossel

Lewis

Sidwick

Which of the following molecule has zero dipole moment.

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NH3

CHCl3

H2O

BF3

Which of the following molecules have unpaired electrons is the bonding molecular orbitals.

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N2

O2

B2

F2

Which one of the following has no tendency of form coordinate covalent bond with H+

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NH3

H2O

CH4

CH3OH

Which pair are iso electronic.

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Na+ and Cl-

Na+ and Mg+2

N-3 and P-3

H+ and H-

In BeCl2, the covalent bond is formed due to overlap of

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sp -s

sp -p

sp2 -p

sp3 -p

What is bond order.

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Number of unpaired electrons

Number of paired electrons

Number of electrons present in antibonding molecular orbital

Number of bond formed between two atoms after overlap

Fluorine molecule (F₂) is formed by the overlap of

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s - s orbital

s - p orbital

p - p head on overlapping of orbitals

p - p parallel overlapping of orbitals

______ Molecule has zero dipole moment.

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CO

H2S

SO2

CH4

Which of the following statements is not correct regarding bonding molecular orbitals

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Bonding molecular orbitals possess less energy than atomic orbitals from which they are formed

Bonding molecular orbitals have low electron density between the two nuclei

Every electron in the bonding molecular orbitals contributes to the attraction between atoms

Bonding molecular orbitals are formed when the electron waves undergo constructive interference

The number of bonds in nitrogen molecules is.

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One pi and one sigma

One pi and two sigma

Thre sigma only

Two pi and one sigma

SP^3-hybridization in important in describing the bonding in

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Which of the following species has unpaired electrons in anti bonding molecular orbitals

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O2

N2

B2

F2

Carbon atom in methane in hybridized.

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sp3

Sp2

Sp

dsp3

Which of the following molecules contain six bonding electrons.

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CH4

CO2

BF3

H2S

The molecule having zero dipole moment is.

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NH3

CHCl3

H2O

BF3

Dipole Moment of H2O is.

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1.61 D

1.85 D

0.95 D

1.49 D

Forces of attraction between He atoms are.

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Hydrogen bonding

London forces

Debye forces

Ion dipole forces

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