Question # 1

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

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

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Octahedral

Distorted tetrahedral

Planar triangle

Linear

The bond angles in methane CH₄are equal to

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109.5°

107.5°

104.5°

120°

On the basis of VSEPR theory SO₂is a

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Liner molecule

A bent molecule

A strong molecule

A gaseous molecule

Which of the following has unchanged valency?

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H

Na

Fe

Oxygen

The shape of the molecule SF₂Cl₂is

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Trigonal bipyradmidal

Cubic

Octahedral

Tetrahedral

Which for the following has no dipole moment

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HCI

H₂S

H₂O

CO₂

Which of the following has zero depole-moment?

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CIF

PCl₃

SiF₄

CFCl₄

Elements have the tendency to attain 8 electrons in their valence shell. This is known as

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Octer rule

Hunds rule

Pauli exclusion principle

Auf ban principle

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

Antibonding MO is formed by

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Addition of atomic orbitals

Substraction of atomic orbitals

Multiplication of atomic orbitals

None of these

The bond angle H - O - H in ice ins closest to

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120° , 28^'

60°

90°

109°

When an electron is absorbed in an empty or partially filled orbital of an atom, the energy released is called

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Ionization energy

Potential energy

Electron affinity

Bond energy

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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 bond order for He₂molecule is

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zero

1/2

1

2

Which of the following molecules have multiple bonds

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CH₄

C₂H₄

C₂H₆

CCI₄

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

Which of the following species is paramagnetic?

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CO₂

NO

O^2-

CN

In which of the following theories the hybridizationis considered

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Vsepr

Lewis

Molecule orbital

Valence bond

The number of bonds in nitrogen molecule is

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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

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

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

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

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

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

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Decreases

Increases

Remain same

Increases alternatively

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 geometry of 4 sp³hybrid orbitals on an atom is

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Square planar

Tetrahedral

Trigonal planar

Linear

Three sp²hybrid are co-planar at an angle of

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104.5°

109.5°

107°

120°

Which of the following charge

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Li

Be

H

He

Generally the bond formed by metals with non-metals is

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Ionic

Covalent

Polar

Non- polar

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