Question # 1

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

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The overlapping of two partially filled atomic orbital is in such a way that the probability of finding the electron pair is maximum along the axis joining the two nuclei, the bond is

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Sigma bond

Pi bond

Ionic bond

Non-polar bond

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

SnCI₂have ______ shape

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Planner

Tetrahedral

Angular

None

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154 pm

133 pm

120 pm

150 pm

The number of bonds in nitrogen molecule is

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

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Be

Mg

Sr

calcium

Generally the bond formed by metals with non-metals is

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Ionic

Covalent

Polar

Non- polar

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

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

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120° , 28^'

60°

90°

109°

The degree of polarity of molecule is known as its

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Dipole moment

Moment arm

Bond energy

Ionic character

Outer shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be

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XY

X₂Y

X₂Y₃

XY₂

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

Which of the following has polar bond

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O₂

N₂

HCl

Cl₂

Generally ionization energy of atoms decreases by

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Decreases in atomic size

Increase in atomic size

Increase in nuclear charge

None of these

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

Which of the following charge

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Li

Be

H

He

Planar geometry of molecules is due to

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sp³hybridization

sp²hybridization

sp hybridization

P - p overlap

Ionic radius, in a period from left to right

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Increases

Decreases

Decreases then increases

Increases and decreases

The bond order O₂molecule is

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1

2

3

Zero

The bond order for He₂molecule is

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zero

1/2

1

2

The shape of gaseous SnCl₂is

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Tetrahedral

Linear

Angular

T-shaped

Which of the following is a polar molecules

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Carbon dioxide

Carbon tetrachloride

Methanol

Ethane

Covalent compounds are soluble in

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Polar solvents

Non-polar solvents

Concentrated acids

All solvents

On the basis of VSEPR theory SO₂is a

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Liner molecule

A bent molecule

A strong molecule

A gaseous molecule

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

The nature of interparticle forces in benzene is

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Dipole-dipole interaction

Dispersion force

Ion-dipole interaction

H-bonding

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 formation of compounds like PF₅, BCI₃, SF₆indicates that

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These halides are ionic

These halides are covalent

They are Lewis acids

Octet rule not obeyed so the rule is not universal

Which of the following hydrides has the lowest boiling point?

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H₂O

H₂S

H₂S3

H₂Te

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