Question # 1

In which of the following theories the hybridizationis considered

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Vsepr

Lewis

Molecule orbital

Valence bond

Ca, Mg, Be, Ba, belong to the same group, the order of their ionization energy values is

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Be > Mg> Ca > Ba

Ba > Ca > Mg > Be

Ca > Mg > Be > Ba

Ba > Mg > Ca > Be

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

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The bond order for He₂molecule is

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zero

1/2

1

2

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

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O₂

N₂

Br₂

F₂

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 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

Shape of CIO₃is

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Triangular pyramidal

Tetrahedral

Triangular planar

Triangular bipyramidal

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

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Be

Mg

Sr

calcium

Planar geometry of molecules is due to

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sp³hybridization

sp²hybridization

sp hybridization

P - p overlap

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

The ionic bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

Generally the bond formed by metals with non-metals is

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Ionic

Covalent

Polar

Non- polar

Which of the following geometry is associated with the compound in which the central atom assumes sp³d hybridization?

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Planar

Pyramidal

Angular

Trigonal bipyramidal

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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

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

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Decreases

Increases

Remain same

Increases alternatively

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

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Which of the following molecules has a net dipole moments

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CO₂

CS₂

SO₂

CCI₄

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

Which one of these is weakest?

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Ionest bond

Covalent bond

Metallic bond

Van der Waal's forces

On the basis of VSEPR theory SO₂is a

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Liner molecule

A bent molecule

A strong molecule

A gaseous molecule

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

Hydrogen chloride molecule contains

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Covalent bond

Double bond

Co-ordinate bond

Electrovalent bond

The degree of polarity of molecule is known as its

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Dipole moment

Moment arm

Bond energy

Ionic character

The number of antibonding electron pairs in O^2-molecular ion on the basis of MOT is

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4

3

2

5

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

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

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