Question # 1

The purification of Bauxite can be carried out.

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Baeyer's process

Hall's process

Serpek's process

Any of above

Lead pencil contain

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Lead

Lead sulphide

a mixture of lead and silica

graphite

Used in TV sets and sound movies to give ready response to electrical potential

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He

Ne

Ar

Kr

In group 17, the element with highest first ionization enthalpy belongs to.

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Period 1

Period 2

Period 7

Period 6

The strongest acid is.

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HNO2

HNO3

H2N2O2

HNOS

When two H atoms approach each other then forces operates.

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Attractive forces

Repulaive forces

Attractive and repulsive

None of above

Give violet colour to flame

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Gallium

indium

Thallium

Aluminium

In a period, the element with biggest electron affinity belong to.

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Group 1

Group 2

Group 17

Group 18

Which of the following compounds liberates CO2 on heating.

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Li2CO3

Na2CO3

K2CO3

All liberate CO2 on heating.

The electronic configuration of sodium (Z=11)

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1s2, 2s2, 2p4

1s2, 2s2, 2p6, 3s2 , 2p5

1s2, 2s2, 2p6, 3s1

1s2, 2s2, 2p6, 3s2

The high oxidizing power of halogens is favored by.

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Low heat od dissociation of X2

A high electron affinity of the atom

A higher hydration energy of the ion

All of above

When borax is strongly hented, it gives

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B2O4

Na2B4O7

NaBO2

NaBO2 + B2O3

The name hydrogen was proposed by.

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Lavoisier

Rutherford

Henry Cavandish

Scheele

Which one has a co ordinate bond.

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Al2Cl6

BF3

NaCl

O2

The element having electronic configuration 1s2, 2s2, 3s2, 3p3 is.

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Trivalent only

Tetravalent only

Trivalent and pentavalent

Pentavalent only

Sodium silicate is used

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In the paint industry

For fixing labels to glass

In a soap industry

All above

What is the following is incorrect.

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Water is more polar than H2S

H2O2 is a planar molecule

Heavy water is produced by the exhauative electrolysis of water made acidic

H2O2 act both as oxidising as well as reducing agent in acidic medium

The noble gas used or treatment of cancer is

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Helium

Argon

Radon

Krypton

The bond between two identical non metal atoms has a pair of electrons.

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Unequally shared between the two

Transferred fully from one atom to another

With identical spins

Equally shared between them

The H2SO4 obtained by the contact process having purity

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70%

74%

78%

82%

Fluorine form Fluorides reacting with

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Metals

Non metals

Metalloide

Any of above

Which of the following is not true of ozone.

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It is a strong electilizing agent

It attacks organic compounds containing carbon carbon double bond

Its molecular is linear and has two different O-O bond lengths

It is more powerful oxidising agent at molecular oxygen

Which of the following statements is not correct about noble gases.

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Their ionization energies are very high

Their electron affinities are nearly zero

They do not form any chemical compounds

They are not easily liquefied

Which of the following has the maximum tendency to form complexes.

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K

Na

Rb

Li

Which of the following is not a property of Cr.

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it is brilliant silvery metal

it is malleable

It can take very high polish

Its surface is tarnished easily

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