Question # 1

The ratio of close packed atoms to tetrahedral holes in cubic close packing is

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1 : 1

1 : 2

1 : 3

2 : 1

A zero order reaction is one whose rate is independent of

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Temperature of the reaction

The concentration of the reactants

The concentration of the products

The material of the vessel in which the reaction is carried out

The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends on

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Pressure of the gas

Temperature of the gas

Volume of the gas

Pressure temperature and volume of the gas

Which species represents the electrophile in aromatic nitrotaion?

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NO^-₂

+

NO₂

NO2

NO^-₃

Vital force theory was rejected by

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Berzelius

Kolbe

Wholer

Lavoiser

Variable valency is generally exhibited by

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Normal elements

Transition elements

Metallic elements

None of these

In crystal structure of sodium chloride the arrangement of CI^- ions is

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Fee

Both fee and bcc

Bee

None of these

Which of the following compounds has the lowest anion to cation size ratio?

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LiF

NaF

CsI

CsF

The substance used as a smoke screen in warfare is

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SiCI₄

PH₃

PCI₅

Acetylene

Mark the smallest atom

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F

CI

Br

I

How many kinds of space lattices are possible in a crystal?

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23

7

230

14

In a crystal a≠b≠c, a =γ= 90° andβ≠90°. It is

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Monoclinic

Rhombic

Trigonal

Tetragonal

Which is the most volatile compound?

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HI

HCl

HBr

HF

Reaction of acids with alcohols is also known as

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Esterification

Saponification

Alkalization

None

Octane number can be changed by

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Isomerisation

alkylation

Cyclisation

All of these

Which one is not a pollutant normally?

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Hydrocarbons

Carbon dioxide

Carbon monoxide

Sulphur dioxide

Chief air pollutant which is likely to deplete ozone layer

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Suphure dioxide

Carbon dioxide

Nitrogen oxides and chloro flrorocarbons

During the folding of filter paper the apex form angle of about

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80°

60°

180°

90°

Phosphorus pentoxide finds use as

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An oxidizing agent

A reducing agent

a bleaching agent

A dehydration agent.

Each of following is true of white and red phosphours except that they

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Are both soluble in CS₂

Can be oxidized by heating in air

Consist of the same kind of atoms

Can be converted into one another

Reaction of ethylamine with chloroform in alcoholic KOH produces

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CH₃OH

CH₃NC

C₂H₅NC

C₂H₅CN

Which has largest first ionization energy?

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Li

Na

K

Rb

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