Question # 1

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 unpaired electrons in anti-bonding molecular orbitals?

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O₂

N₂

Br₂

F₂

The covalent bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

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 has polar bond

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O₂

N₂

HCl

Cl₂

Mg becomes isoelectronic with neon when it

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Loses two electrons

Gains two electrons

Loses 1 electron

Gains 1 electron

The geometry of 4 sp³hybrid orbitals on an atom is

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Square planar

Tetrahedral

Trigonal planar

Linear

Covalent compounds are soluble in

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Polar solvents

Non-polar solvents

Concentrated acids

All solvents

The structure of ICI₂is

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Trigonal

Trigonal bipyramidal

Octahedral

Square planar

Which is made by coordinate covalent bond

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H₃O⁺

H₂O

CH₄

HCl

When of the following is isolelectronic with krypton

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Ca⁺⁺

Al⁺⁺⁺

Br^-1

I^-1

Which of the following molecules have multiple bonds

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CH₄

C₂H₄

C₂H₆

CCI₄

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

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Excitantion of an electron from 2s to 2p-orbital

Transfer of three electrons from B to the other atoms

Excitation of two electrons form 2s orbital to 2p orbital

Formation of molecular ion

The degree of polarity of molecule is known as its

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Dipole moment

Moment arm

Bond energy

Ionic character

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

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

Planar geometry of molecules is due to

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sp³hybridization

sp²hybridization

sp hybridization

P - p overlap

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 carbon is more electronegative?

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sp³- hybridized carbon

sp-hybridized carbon

sp²-hybridized carbon

always same irrespective of its hybrid state

Number of sigma bonds in P₄O₁₀is

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6

7

17

16

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

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

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Sp³hybridization

Sp²hybridization

Sp hybridization

All of these

The ionic bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

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

XeF₄has shape of

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Sphere

Trigonal bipyramidal

Tetrahedral

Square planar

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

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1.6

1.7

1.8

1.0

SnCI₂have ______ shape

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Planner

Tetrahedral

Angular

None

Three sp²hybrid are co-planar at an angle of

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104.5°

109.5°

107°

120°

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

On the basis of VSEPR theory SO₂is a

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Liner molecule

A bent molecule

A strong molecule

A gaseous molecule

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