Question # 1

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

Hydrogen chloride molecule contains

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Covalent bond

Double bond

Co-ordinate bond

Electrovalent bond

Mg becomes isoelectronic with neon when it

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Loses two electrons

Gains two electrons

Loses 1 electron

Gains 1 electron

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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

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

Number of sigma bonds in P₄O₁₀is

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6

7

17

16

According to MO Theory, the species O₂+ possesses

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bond order of 2.5

three unpaired

diamagnetic character

stability lower then O₂

All covalent bonds formed between the two atoms are non-polar when

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Covalent bond between two non-metal atoms

Covalent bond between metal and non-metal

Covalent bond between two atoms of same element

Covalent bond between metal atoms

The structure of ICI₂is

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Trigonal

Trigonal bipyramidal

Octahedral

Square planar

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

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Be

Mg

Sr

calcium

In H₂O molecule the bond angle is

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90°

109.5°

107°

104.5°

The nature of interparticle forces in benzene is

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Dipole-dipole interaction

Dispersion force

Ion-dipole interaction

H-bonding

Planar geometry of molecules is due to

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sp³hybridization

sp²hybridization

sp hybridization

P - p overlap

In sp²hybridization bond angle is _____

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120°

180°

109.5°

None

The Electro-negatively difference for ionic bond must be greater than

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1.6

1.7

1.8

1.0

Which of the hydrogen halides has the highest percentage of ionic character

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HCl

HBr

HF

HI

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

Atoms obey octet rule by sharing-electrons making covalent bonds according to

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Lewis and Kossal theory

Valance bond theory

VSEPR theory

Molecular orbital theory

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

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

Which of the following charge

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Li

Be

H

He

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

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154 pm

133 pm

120 pm

150 pm

Two H-atom combine to form a strong H₂molecule due to

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Increase in potential energy

Decrease in potential energy

Energy remains unchanged

Distance is increased

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

Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding?

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Orbital overlap will not occur

Bonding will not occur

Both (A) and (B) are correct

None of the above are correct

Which of the following is a polar molecules

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Carbon dioxide

Carbon tetrachloride

Methanol

Ethane

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