Question # 1

According to VSEPR theory, the shape of the water molecule is

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Octahedral

Distorted tetrahedral

Planar triangle

Linear

Which of the following charge

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Li

Be

H

He

The bond order of individual C - C bond is benzene is

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One

Two

Between one and two

One and two alternately

Which of the following molecules have sp³hybridized carbon

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CH₄

C₂H₄

C₂H₂

CO₂

In which of the following theories the hybridizationis considered

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Vsepr

Lewis

Molecule orbital

Valence bond

The bond angles in methane CH₄are equal to

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109.5°

107.5°

104.5°

120°

If two lone pairs are present then bond angle of tetrahedral compound reduces to ______ degrees

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109.5°

107.5°

104.5°

None

B-atom in BF₃has

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sp³hybridization

sp²hybridization

sp hybridization

no hybridization

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

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A molecule in which sp²hybrid orbitals are used by the central atom in forming covalent bonds in

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He₂

SO₂

PCl₅

N₂

Which of the following molecules has a net dipole moments

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CO₂

CS₂

SO₂

CCI₄

Planar geometry of molecules is due to

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sp³hybridization

sp²hybridization

sp hybridization

P - p overlap

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

The bond order for He₂molecule is

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zero

1/2

1

2

SnCI₂have ______ shape

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Planner

Tetrahedral

Angular

None

Molecular orbital picture of N₂indicates

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One unpaired electron

Two unpaired electron

No unpaired electron

None of these

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

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Sp³hybridization

Sp²hybridization

Sp hybridization

All of these

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154 pm

133 pm

120 pm

150 pm

Fluorine molecule is formed by

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The axial p-p overlap

The sidewise p-p overlap

The axial s-p overlap

The overlap of two sp²hybrid orbitals

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⁺

Mg becomes isoelectronic with neon when it

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Loses two electrons

Gains two electrons

Loses 1 electron

Gains 1 electron

Which of the following species is paramagnetic?

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CO₂

NO

O^2-

CN

Size of an anion is increased as compared to its atom because of the

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Addition of new shell

Repulsion of electrons in the valence shell

Decrease in nuclear charge

Increase in the unclear charge

The electron affinity of chlorine may be represented by the equation

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Generally ionization energy of atoms decreases by

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Decreases in atomic size

Increase in atomic size

Increase in nuclear charge

None of these

Which of the following has unchanged valency?

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H

Na

Fe

Oxygen

Tripple bond is present in

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O₂

H₂

N₂

Cl₂

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

When two hydrogen atoms approach to form a chemical bond

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The repulsive forces dominate the attractive forces

The attractive forces, dominate the repulsive forces

The energy of atoms increases

The two atoms start ionization

Nitrogen in NH₃is sp³hybridized but the bond angle in NH₃is 107° and not 109.5° due to

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sp³orbital planar

sp³orbital trigonal

Repulsion between lone pair and bonded pairs

None of them

Among the alkaline earth metals the element forming predominantly covalent compounds is

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Be

Mg

Sr

calcium

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