Question # 1

A covalent bond may be

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100% covalent

Partial ionic

100% ionic

Both a and b

Total number of valence electrons in phosphonium ion (PH4-) is

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8

9

12

10

Which of the following molecule has zero dipole moment?

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PCI3

BF3

NH3

H2O

The no. of Ip's on oxygen in CO are

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1

3

4

2

The ionization energy

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generally increases from left to right in a period

increases from top to bottom in a group

does not change in a period

does not change in a group

What will be the shape of a molecule which containstwo sigma bond pairs and one lone pair?

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Linear

V shape

Tetragonal

Triangular

Mostly ionic compounds are produced between elements of group

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IA and IIA

IB and VIB

IA. IIA and VII-A

IA and IB

Energy of atom in compound is

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Higher than individual atom

Lower than individual atom

equal to individual atom

Impossible to predict

The elements for which the value of ionization energy is low can

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Gain electrons readily

Lose electron less readily

Gain electrons with difficulty

Lose electron readily

What is not true for NH4CI

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It has ionic bond

It has covalent bond

It has coordinate bond

It has hydrogen bond

Covalent bonds are

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directional

Bidirectional

Multidirectional

Non directional

Bond will be covalent when electronegativity difference of bonded atom is

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Equal to 1.7

between 0.5 to l.7

Greater to 1.7

zero

lonic bond is produced after complete transfer of

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nucleus

neutrons

electrons

protons

Which one is a non-polar compound?

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SnCl2

PH3

Gecl4

H2O

Low IE is a symbol of

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high electronegativity

small size

High electron affinity

Metallic character

Geometry of simple molecule with sp2 hybridization

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Triangular planar

Trigonal

Square planner

Pyramidal

Octet rule is not allowed in the formation of

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NF3

B.CF4

CCI4

PCI5

For formation of ionic bond, electronegativity difference should be

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Equal to zero

Equal to 0.5

More then 1.7

Less than 1.7

The ionization energy of hydrogen atom is

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Zero

131.3kJmole

13.13kJ/mole

1313kJ/mole

At compromise distance the forces dominating between atoms are

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repulsive forces

attractive forces

Dipole induced dipole force

H-bonding

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