Question # 1

The alkali metal that react with nitrogen directly to form nitrides.

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Na

K

Rb

Li

Total pressure exerted by a mistress of two or more than two gases in a definite volume as any given temperature is equal to the sum of partial pressures which each gas would exert, if it occupied the same volume alone, at the same temperature This is a statement.

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Boyle's law

Charle's law

Graham's law

Dalton's law

The percentage of nitrogen in ammonium sulphate is__________%

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27

21

23

19

Which of the following molecules have centre of symmetry.

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H2O

HCl

CO2

H2SO4

Major ingredients of traditional ceramics

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Silica

Clay

Feldspar

All

Which of the following technique in current voltage technique

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Amperometry

Voltammetry

Poteatiomertry

Polarography

Which of the following is a non degradable pollutant.

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Long chain phenoiics

DDT

Mercuric salts

All above

Proper proportioning of concrete, ensures

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Resistance to water

Desired durability

Water tightens of the structure.

All

Which pair of species can undergo chemical reaction with each other.

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CO+ NO

LiH and H2O

CO2 and HCl

CaH2 and SI H4

The vapours attacks the eyes and mucous membrane of nose and throat

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F

Cl

I

Br

The width of a carbon nano tube is.________ nm

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1

1.3

2.5

10

Air pollution is not caused by

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Pollen grains

Hydroelectric power

Industries

automobiles

Which of the following statements is wrong.

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Covenant compounds are generally soluble is polar solvents.

Covalent compounds have low melting and boiling points

Lower than that of separate H atoms

Sometimes lower and sometimes higher than that of separate H

Which of the following substance acts as gaseous pollutant.

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NO

NO2

CO

SO2

All above

Which of the following elements has the highest density.

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Mg

Na

K

Rb

Which of the following statements is not correct.

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The conductance of one cm3 of a material is called specific conductance

Specific conductance increase while equivalent conductance decreases on progressive dilution

The limiting equivalent conductance of weak electrolytes cannot be determined by extrapolation of the plot of A against concentration

The conductivity of metals is due to the movement of elctrons.

Oxides ores of Aluminium

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Corundum

Bauxite

Diaspore

All above

Are used as water repellents

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Carbides

Silicon

Silicones

Silicates

Vitamin which contains cobalt is.

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Vitamin B1

Vitamin B2

Vitamin B6

Vitamin B12

The noble gases are used due to having property

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Chomical inertness

Low boiling point

Any of a or b

Both a and b

The use of acids to remove oxides and acids on hot worked steels is known as

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Tempering

Picking

Machining

Sizing

Monomer of neoprene rubber to

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1-chloro 1,3- butadiene

2- chlro, 1,3-butadiene

2-Bromo -1,3- butadiene

2-Methyl 1,3-butadiene

A device which is used to measure the interracial angle is known as

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Voltmeter

Potentiometer

pH Meter

Goniometer

The oxidation number of Mn in KMnO4

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+5

+7

+4

+3

Gravimetric method is based on which of the following property.

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Volume of a liquid

Volume of gas

Mass of substance

Viscosity

The electrophile in the sulphonation of benzene is.

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SO3

SO3H

HSO4

SO2

If for a solution of an electrolyte. It is the transport number of the cation, then the transport number of the anion I, is equal to

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t/2

1 - t+

1 + t+

(i -t) /2

Pick out the incorrect statement for CIF3

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It has trigonal planar geometry

It is used to make gaseous UF6 which is useful in making enriched U-235 fuel

It is used as powerful fluorinating agent for inorganic compounds

CIF2 has been used as fuel in short range rockets reating with hydrazine.

Aque regia is made by dissolving a mixture of HNO3 and HCl with ratio.

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1 : 1

1 : 3

1 : 2

1 :10

The compound which does not act as Lewis acid is.

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BF3

AlCl3

BeCl2

SnCl4

Eutrophication is process which involves

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Depletion of ozone layer

Increase in the concentration of ozone in water

Decrease in the concentration of dissolved oxygen in water by algae

Decrease in the level of SO2 in air

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