Question # 1

Number of sigma bonds in P₄O₁₀is

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6

7

17

16

The bond order in No is 2.5 while that in NO⁺is 3.Which of the following statements is true for these two species?

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Bond length in NO⁺is greater than in NO

Bond length in unpredictable

Bond length in NO⁺is equal to that in NO

Bond length in NO is greater than in NO⁺

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The ionization energy of A is high and electron affinity of B is low

The ionization energy of A is low and electron affinity of B is high

Both the ionization energy of A and electron off affinity of B are high

Both the ionization energy of A and electron affinity of B are low

The boiling point of heavy water is

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108°C

101.4°C

99°C

110°C

The tendency of an atom to attract shared electron pair towards itself is called

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Covelent bond

Electronegativity

Ionization potential

Electronic affinity

The bond order for He₂molecule is

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zero

1/2

1

2

During the formation of a chemical bond the potential energy of the system

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Decreases

Increases

Does not change

None of these

The bond angles in methane CH₄are equal to

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109.5°

107.5°

104.5°

120°

Water H₂O is liquid while hydrogen sulphide H₂S is a gas beause

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphure has high electronegativity than oxyhe

Water molecules associate through hydrogen bonding

Which of the following hydrides has the lowest boiling point?

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H₂O

H₂S

H₂S3

H₂Te

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

SnCI₂have ______ shape

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Planner

Tetrahedral

Angular

None

Which is made by coordinate covalent bond

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H₃O⁺

H₂O

CH₄

HCl

XeF₄has shape of

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Sphere

Trigonal bipyramidal

Tetrahedral

Square planar

The number of bonds in nitrogen molecule is

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The driving force for making a bond is

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To attain noble gas electronic configuration

To make soled compounds

To make different compounds

To make gaseous substances

Which of the following is a polar molecules

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Carbon dioxide

Carbon tetrachloride

Methanol

Ethane

Hydrogen chloride molecule contains

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Covalent bond

Double bond

Co-ordinate bond

Electrovalent bond

Atomic number of Al is 13. When it forms ionic bond with oxygen the number of electrons lost by 1 Al atom is

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1

2

3

4

The most suitable method of the separation of a mixture of ortho and para-nitrophenol mixed in the ratio of 1: 1 is

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Distrillation

Crystallization

Vapourisation

Colour spectrum

A bond between two atoms may be obtained by sharing of electrons such a bond is called

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An ionic bond

A coordinate bond

A dative bond

A covalent bond

In a group the atomic size increase downward due to

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Addition of electronic shells

Increase in the proton number

Repulsion of electrons

All of the above

In which of the following theories the hybridizationis considered

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Vsepr

Lewis

Molecule orbital

Valence bond

Which of the following molecules have sp³hybridized carbon

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CH₄

C₂H₄

C₂H₂

CO₂

The shape of methanol, ammonia and water molecule can be explained by assuming

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Sp³hybridization

Sp²hybridization

Sp hybridization

All of these

The covalent bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

Molecular orbital picture of N₂indicates

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One unpaired electron

Two unpaired electron

No unpaired electron

None of these

The nature of interparticle forces in benzene is

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Dipole-dipole interaction

Dispersion force

Ion-dipole interaction

H-bonding

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Excitantion of an electron from 2s to 2p-orbital

Transfer of three electrons from B to the other atoms

Excitation of two electrons form 2s orbital to 2p orbital

Formation of molecular ion

The bond order O₂molecule is

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1

2

3

Zero

B-atom in BF₃has

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sp³hybridization

sp²hybridization

sp hybridization

no hybridization

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