Question # 1

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 is made by coordinate covalent bond

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H₃O⁺

H₂O

CH₄

HCl

Which of the following molecules have sp³hybridized carbon

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CH₄

C₂H₄

C₂H₂

CO₂

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

Which of the following has unchanged valency?

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H

Na

Fe

Oxygen

The boiling point of heavy water is

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108°C

101.4°C

99°C

110°C

Generally electron affinities for elements in a period from left to right

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Decreases

Increases

Remain same

Increases alternatively

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

XeF₄has shape of

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Sphere

Trigonal bipyramidal

Tetrahedral

Square planar

The ionic bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

An ionic compound M₂S₃is formed by the metal M,, the metal is

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Ca

Ba

K

Al

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

Ionization energies increase from left to right along the period due to

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Increase in nuclear charge

Repulsion of electron increases

Repulsion of protons increase

Atomic size increase along the period

Which of the following molecules has unpaired electrons in anti-bonding molecular orbitals?

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O₂

N₂

Br₂

F₂

The three N - Hσ-bonds are made by

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sp³- s overlap

sp²- s overlap

P - p overlap

sp - overlap

In H₂O molecule the bond angle is

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90°

109.5°

107°

104.5°

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

Ionic radius, in a period from left to right

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Increases

Decreases

Decreases then increases

Increases and decreases

One of the following bonds is polar but compound is non-polar

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H₂O

NH₃

HCl

CO₂

Which of the following has polar bond

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O₂

N₂

HCl

Cl₂

The force which holds the atoms together to form a compound is called

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A chemical bond

Van der waal's force

Dispersion force

London force

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⁺

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

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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 structure of ICI₂is

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Trigonal

Trigonal bipyramidal

Octahedral

Square planar

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

In sp²hybridization bond angle is _____

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120°

180°

109.5°

None

The electron affinity of chlorine may be represented by the equation

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Electronegativity values of the elements F, CI and Br vary

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F > CI > Br

Br > CI > F

Cl > Br > F

CI > F > Br

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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