Question # 1

Along period of periodic table shielding effects.

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Increases

Decreases

Remain constant

First increases than decreases

Ionic bond is formed by combination of groups

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IA and VIII

II A and VII A

IV A and VA

VIA and VII A

A molecular orbital can accommodate maximum electron

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2

6

8

10

Percentage ionic character of HF is.

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100%

80%

43%

57%

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

Those elements whose electronegativities are 1.2 and 3.2, react to form

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Ionic bond

Covalent bond

Gaseous substance

Definiting a liquid substance

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

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346

436

463

336

The tendency of an tom to attract shared pair of electron towards itself is called its.

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Ionization energy

Electronegativity

Electron affinity

dipole moment

VSEPR theory was proposed by

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Nyholn and Gillespie

Kossel

Lewis

Sidwick

Chlorine atom and chloride Cl- ions

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Have same chemical and physical properties

Are allotropes of chlorine

Have same number of electrons

Have same number of proton

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

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HF

HCl

H2O

H2

What type of bonding is present in NH4Cl

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Ionic

Covalent

Co ordinate covalent

All of these

Which one of the following molecules is paramagnetic.

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H2

He

N2

O2

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

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HF

HBr

HCl

HI

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

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O2⁺²

N2^-2

B2

F2

Which of the following molecules contain six bonding electrons.

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CH4

CO2

BF3

H2S

Which has zero potential energy.

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When H atom is independent

When two H atoms combine to form H2 molecule

When two H atoms super impose to each other

When two H atoms have weak attraction between them

In which molecule all atoms are coplanar.

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CH4

BF3

NH3

PH3

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