Question # 1

Arsenic impurities in contact process are removed.

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By prolong heating the gases

By treatment with Fe(OH)3

In scrubbing tower

In absorption tower

Which class of elements shows law value of first ionization potential.

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Alkali metals

Alkaline earth metals

Halogens

Noble gases

Which element form an ion with charge +3

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Beryllium

Aluminum

Carbon

Sillicon

Which element among the following belongs to Group IV A of the Periodic table.

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Barium

Iodine

Lead

Oxygen

Oxides of alkaline earth metal are

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Acidic

Basic

Neutral

Amphoteric

Fats are

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Saturated glycerides

Unsaturated glycerides

Polyhydroxy ketose

Polyhydroxy aldose

Which one of the following compounds undergoes Cannizzaro's Reaction.

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Acetaldehyde

Benzaldehyde

Acetone

Propionaldehyde

In Pakistan pulp is usually bleached with Cl2. The residual chlorine is removed from pulp by an antichlor which is

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dil HCl

dil NaOH

Water

NaCl

Saturated hydrocarbon are also called.

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Olefins

Acetylenes

Paraffins

Alicyclic

Lowest oxidation state of nitrogen is present in.

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NH3

NO2

NO

HNO3

The avoid teh formation of toxic compounds with chlorine which substance is used for disinfecting water.

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KMnO4

O3

Alum

Chloramines

A gas decolorizes alkaline KMnO4 but has no action with ammoniacal AgNO3, this gas may be

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C2H2

C2H4

C2H6

CH4

Which one is basic amino acid

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Lysine

Alanine

Glycine

Aspartic acid

All of the following tests are used to identify aldehydes except.

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Tollen's test

Fehling test

Baeyer's test

Benedict test

Which one of the following is calcareous material

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Marine shells

clay

Shale

Blast furnace slag

Which one is perchloric acid

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HClO

HClO₃

HClO₄

Hydrolysis of benzene sulphonic acid with superheated steam or by boiling with dil HCl gives.

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Toluene

Benzene

Xylene

Chlorobenzene

Chlorine heptoxide reacts with water to form

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Hypochlorous acid

Chloric acid

Perchloric acid

Chlorine and oxygen

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