Question # 1

Fertililzer are made by

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Nature only

Artificial methods only

Both artificial and natural methods

None of the above

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fuorine

Chief air pollutant which is likely to deplete ozone layer

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Suphure dioxide

Carbon dioxide

Nitrogen oxides and chloro flrorocarbons

For the carbylamine reaction we need hot alc. KOH and

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Any amin and chloroform

Chloroform and Ag powder

A primary amine and chloroform

A mono alkyl amine and trichlorom-ethane

Given below are some statements concerning formic acid, which of them is true?

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It is a weaker acid than acetic

it is a reducing agent

When its calcium salt is heated, it forms a ketone

It is an oxidizing agent

Which one is primary alcohol?

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Buten-2-ol

Propan-2-ol

Butaon-1-ol

2, 3-Dimethylhexane-4-ol

Which of the following is different from the other three oxides?

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MgO

SnO

ZnO

Cr₂O₃

In cold countries ethylene glycol is added to water in radiators of cars during winter. It results in

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Lowering in b.pt.

Reducing viscity

Reducing specific heat

Lowering in freezing pt.

Natural fertilizer provides phosphorus to plants in the form of P₂O₅

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1.2 kg

2.2 kg

3.2 kg

4 kg

Setting of cement is an

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Exothermic reaction

Endothermic reaction

Neither exothermic nor endothermic

None

At room temperature formaldehyde is

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Gas

Liquid

Solid

None of the above

Number of elements present in the fifth period of periodic table is

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8

10

18

32

In public urinals, we observe some nascent smell. This smell is due to

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Hydrolysis of urea of urine by urease of atmosphere into NH₃and CO₂

Formation of sulphonic acid by urea of urine

Reaction of CO₂of atmosphere with urea mononitrate in urine

Hydregen present in air reacts with nitrogen forming NH₃

The movement of solvent molecules through a semipermeable membrane is called

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Electrolysis

Electrophoresis

Osmosis

Cataphoresis

Minamata disease is due to pollution of

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Organic waste

Oil spill in water

Industrial waste containing mercury into fishing water

Arsenic into the atmosphere

The following has zero valency

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Na

Be

Al

Kr

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