Question # 1

Group IV A consist of elements.

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3

4

5

6

Which of the following substance is colloidal in nature.

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Clay

Al2O3

Fe2O3

All above

In vinyl cyanide, the number of a bonds in

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2

3

1

4

Acid rain is caused due to increase in the concentration of _______ in the atmosphere

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Ozone and dust

CO2 and CO

SO3 and CO

SO2 and NO2

Sulphate ores of aluminium

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Alumite

Cryolite

Fekdsper

Kaolin

The magnetic quantum number (m) specifies the individual orbital in a Sub shell for a given l, m can be.

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l,l- l........-1

l........2, l -3.......-2l

l-l-2,..........-l

l-2,l-4, ............-4l

To increase the life of filament and to low the heat conductivity a mixture in filled in electric bulb.

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Ar & N2

Ar & Kr

Kr & N2

Xe & N2

When calcium is heated in the flame of a Bunsen burner, the colour imparted to the flame is.

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Golden yellow

Brick red

Crimson red

Grassy green

Polyamide jinkage is present in

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Nylon

Silk

Protein

All of these

Iso-osmotic solutions are those which have the same.

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Vapour pressure lowering

Osmotic pressure

Molality

Boiling point elevation

One ppm solution of NaOH Contain 1000 mg of the solute per how much of the volume of the solution.

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1000 mL

100 mL

10 mL

1 mL

Which of the following statements is not correct. with respect to resonance.

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The position of atomic nuclei mus be same

The limiting structures must have same number of paired and unpaired electrons.

The energy of the various limiting structures must contribute equally

All above

If steel is heated to a temperature well below red heated and is then cooled slowly the process is called.

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Annealing

Quenching

Tempering

Nitriding

Which is the purest form of iron.

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Pig iron

Cast iron

Wrought iron

Steel

Which of the following can be used as drying agent of ammonia.

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CaO

Anhydrous CaCl2

P2O5

Conc. H2SO4

The light source in AAS used is

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UV light

Visible light

Radio waved

Hollow cathode lamp

Ammonia when used directly as a fertilizer is to be injected about_____ under the surface to keep it from seeping out.

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2 inches

4 inches

6 inches

10 inches

In biological ecosystem which of the following substance is used by organisms.

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Water

Sunlight

Minerals

All above

Which element out of the following can exhibit a maximum co valency of seven.

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Chlorine

Fluorine

Sulphur

Both Cl and F

Dyes used in photographic plates to make them panchromatic is.

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Cyanine dyes

Azine dyes

Phthalocyanine dyes

Acridine dyes

Photochemical smog consist of excessive amount of X in addition to aldehydes ketones, PAN etc. X is.

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Methane

Carbon monoxide

Ozone

Carbondioxide

The percentage of nitrogen in ammonia is _______________%

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32

82

25

55

Which of the following substance is not weak electrolyte.

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CH3COOH

NH4OH

Oxalic Acid

NaCl

Which of the following statements is false about transition metals.

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They form complexes

They show variable valency

All transition metal compounds are paramagnetic

They form coloured ions

The green colour of glass is due to the presence of.

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Chromium (III)

Cobalt (II)

Mn (IV)

Iron(III)

Anhydrous AlCl3 cannot be obtained by heating hydrated AlOI3 ,6h2o Because.

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It decomposes completely to give Al2O3

It does not lose water completely

It undergoes hydrolysis to give Al(OH)3

AlCl3 .6H2O is very stable.

Explosive trioxide XeO3 is produced when

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XeOF4 reacts with water

XeOF4 reacts with silica

XeF4 reacts with water

Any of above statements

Which of the following has highest ionization energy.

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Oxygen

Argon

Barium

Caealum

Which of the following cast irons is a high carbon, iron carbon silicon alloy.

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Deorizers

Deoxidizers

Deoxifiers

Deterrent

Which of the following give higher fibre strength.

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Eucalyptus

Pine

Bagnasse

Sugar cane

Which of the following is not a ligand or complexing agent.

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NH3

CH3COOH

EDTA

CN-

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