Question # 1

According to MOT, which molecular orbital has highest energy.

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sigma 1s

pi+ 2S

pi 2py

Pi+ 2px

Fluorine molecule (F₂) is formed by the overlap of

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s - s orbital

s - p orbital

p - p head on overlapping of orbitals

p - p parallel overlapping of orbitals

In which one of the following pairs do the molecule have similar shape.

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BF3 and AlCl3

CO2 and H2O

CH4 and PH3

NH3 and BCl3

Which of the following species has unpaired electrons in anti-bonding molecular orbitals

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O₂⁺²

N₂^-2

B₂

F₂

The percentage of s characters in sp3 hybrid orbital is.

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25%

33.3%

50%

75%

Which element has highest ionization potential.

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Li

B

Be

C

The shape of Sncl2 molecule is.

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Linear

Angular

Trigonal planar

Tetrahedral

In methanol, bond between carbon and oxygen.

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Ionic

Non polar

Polar

Co - ordinate

The structure of water molecule is.

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angular

Linear

Trigonal

Trigonal pyramidal

Percentage ionic character of HF is.

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100%

80%

43%

57%

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

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O2⁺²

N2^-2

B2

F2

Bond energy depends upon

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Electronegativity

Size of atom

Bond length

All of these

Which of the following molecules have highest bond energy

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F2

Cl2

Br2

I2

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

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HF

HBr

HCI

HI

Carbon atom in methane in hybridized.

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sp3

Sp2

Sp

dsp3

Which compound does not obey the octet rule.

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NH3

BCl3

H2O

CH4

The H - H Bond energy in KJ mole -1 is.

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346

436

463

336

Which one of the following has the greater ionic characters in it.

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HF

HCl

H2O

H2

Which molecule has sG2 hybridization.

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CH4

C2H4

C2H2

C2H5

Which one of the following molecules is paramagnetic.

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H2

He

N2

O2

Along period of periodic table shielding effects.

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Increases

Decreases

Remain constant

First increases than decreases

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