Question # 1

The three N - Hσ-bonds are made by

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sp³- s overlap

sp²- s overlap

P - p overlap

sp - overlap

The electronegativeities of F,Cl,Br and I are 4.0,3.0,2.8,2.5 respectively.Hydrogen halide with a high percentage of ionic character is

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HF

HCL

HBr

HI

Shape of CIO₃is

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Triangular pyramidal

Tetrahedral

Triangular planar

Triangular bipyramidal

Which of the following molecules have its central atom sp²hybridized

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CH₄

C₂H₂

C₂H₄

CCl₄

The bond order for He₂molecule is

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zero

1/2

1

2

Which carbon is more electronegative?

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sp³- hybridized carbon

sp-hybridized carbon

sp²-hybridized carbon

always same irrespective of its hybrid state

The atomic radius of hydrogen is 37

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Pecometer

Manometer

Angstrom

Micrometer

In H₂O molecule the bond angle is

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90°

109.5°

107°

104.5°

N-atom forms three covalent bonds, its electronic configuration is

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The formation of compounds like PF₅, BCI₃, SF₆indicates that

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These halides are ionic

These halides are covalent

They are Lewis acids

Octet rule not obeyed so the rule is not universal

In OF₂, number of bond pairs and Ione paris of electrons are respectively

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2,6

2,8

2,10

2,9

The nature of interparticle forces in benzene is

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Dipole-dipole interaction

Dispersion force

Ion-dipole interaction

H-bonding

When elements of group I react with the elements of group VIA theory form

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Ionic bond

Covalent bond

Polar bond

None

Atoms obey octet rule by sharing-electrons making covalent bonds according to

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Lewis and Kossal theory

Valance bond theory

VSEPR theory

Molecular orbital theory

Which of the following molecules has a net dipole moments

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CO₂

CS₂

SO₂

CCI₄

H-bonding is not present in

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Glycerine

Water

Hydrogen sulphide

Hydrogen fluride

Maximum hydrogen bonds in water are

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4

3

2

8

Which of the following has unchanged valency?

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H

Na

Fe

Oxygen

The overlapping of two partially filled atomic orbital is in such a way that the probability of finding the electron pair is maximum along the axis joining the two nuclei, the bond is

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Sigma bond

Pi bond

Ionic bond

Non-polar bond

B-atom in BF₃has

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sp³hybridization

sp²hybridization

sp hybridization

no hybridization

The shape of the molecule SF₂Cl₂is

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Trigonal bipyradmidal

Cubic

Octahedral

Tetrahedral

Tripple bond is present in

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O₂

H₂

N₂

Cl₂

The electronegativity of elements in a period from left to right

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Decreases

Increases

First decreases then increases

First increases then decreases

Which of the following species has unpaired electrons in antibonding molecular orbitals

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The Electro-negatively difference for ionic bond must be greater than

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1.6

1.7

1.8

1.0

Inter molecular forces in solid hydrogen are

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Covalent forces

Van der Waal forces or London dispersion forces

Hydrogen bonds

All of these

Shielding effect intervening electrons causes

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Decreases in atomic radii in a period from right to left

Increase in atomic radii in a period from left to righ t

Decrease in atomic radii down the group

Increase in atomic radii down the group

The ionic bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

Three sp²hybrid are co-planar at an angle of

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104.5°

109.5°

107°

120°

In sp²hybridization bond angle is _____

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120°

180°

109.5°

None

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

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