Question # 1

Low IE is a symbol of

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high electronegativity

small size

High electron affinity

Metallic character

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

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8

9

12

10

Which one of the following has zero dipole moment

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NH3

CHCI3

H2O

BF3

Which of the following molecule has zero dipole moment?

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PCI3

BF3

NH3

H2O

A molecule that has polar bonds but is overall non - polar

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IF

CCl4

PCI3

All

Octet rule is not allowed in the formation of

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NF3

B.CF4

CCI4

PCI5

pi-bond can be formed by sideways overlap of

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s-orbital

d-orbital

p-orbital

sp orbital

Elements having high ionization potential values are

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metals

non- metal

liquids

solid

The shielding effect of inner electron is responsible for

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Having no effect on ionization energy

Decreasing ionization energy

Increasing ionization energy

Increasing electronegativity

A molecule which contains two lone pairs and two bond pairs of electrons in valence shell of central atom, geometrical shape of molecules will be

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Tetrahedral

Trigonal pyramidal

Angular

Linear

lonic bond is produced after complete transfer of

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nucleus

neutrons

electrons

protons

In a period the atomic radii

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increase

decrease

remain same

first increase, then decreased

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

Which one is a non-polar compound?

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SnCl2

PH3

Gecl4

H2O

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 required to remove electron from an atom

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Ionization potential

Electronegativity

Electropositivity

Electron affinity

Which one of the followings has polar covalent bonds hut is overall nom-polar molecule:

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HF

CO₂

CH₄

N₂

Polarity of a molecule is expressed in terms of

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Bond strength

Dipole moment

Bond length

Shape

The ionization energy of hydrogen atom is

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Zero

131.3kJmole

13.13kJ/mole

1313kJ/mole

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