Question # 1

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

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In which of the following theories the hybridizationis considered

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Vsepr

Lewis

Molecule orbital

Valence bond

Planar geometry of molecules is due to

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sp³hybridization

sp²hybridization

sp hybridization

P - p overlap

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

H-bonding is not present in

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Glycerine

Water

Hydrogen sulphide

Hydrogen fluride

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

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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 bond order for He₂molecule is

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zero

1/2

1

2

Electronegativity values of the elements F, CI and Br vary

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F > CI > Br

Br > CI > F

Cl > Br > F

CI > F > Br

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 species is paramagnetic?

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CO₂

NO

O^2-

CN

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

The number of electron pairs shared in carbon tetrachloride molecule is

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2

3

4

1

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

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

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Be

Mg

Sr

calcium

Atomic number of Al is 13. When it forms ionic bond with oxygen the number of electrons lost by 1 Al atom is

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1

2

3

4

Which of the following hydrides has the lowest boiling point?

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H₂O

H₂S

H₂S3

H₂Te

The structure of ICI₂is

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Trigonal

Trigonal bipyramidal

Octahedral

Square planar

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

Ionic radius, in a period from left to right

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Increases

Decreases

Decreases then increases

Increases and decreases

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

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154 pm

133 pm

120 pm

150 pm

Which of the following has highest bond order

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One of the following bonds is polar but compound is non-polar

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H₂O

NH₃

HCl

CO₂

Mg becomes isoelectronic with neon when it

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Loses two electrons

Gains two electrons

Loses 1 electron

Gains 1 electron

Which of the following molecules have sp³hybridized carbon

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CH₄

C₂H₄

C₂H₂

CO₂

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