Question # 1

Which of the following is the hardest coal?

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Pear

Lignite

Bituminous

Anthracite

Percentage of carbon in peat is.

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50%

60%

70%

80%

Vibrious cholera bacteria causes the disease

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Cholera

Diarrhea

Jaundice

Hepatitis

Ozone id beneficial for us as it:

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absorbs infrared radiations

absorbs ultraviolet radiation

absorbs chlorofluorocarbons

absorbs air pollutants

Which one of the following is manufactured by Solvar's process:

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caustic soda

washing soda

urea

sulphuric acid

Lipids are macromolecules. They have characteristics except one of the following.

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They are high energy foods.

They are soluble in water.

They are poor conductor of heat.

They are esters of fatty acids.

Some orchids attracts bees for pollination by producing.

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alkanes

almenes

alkynes

all the above.

Which factor determines the severity of a pollutant?

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Chemical nature

concentration

Persistence

All of them

How trace amount of acetylene present in the coat gas.

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0.06%

0.07%

0.08%

0.09%

The molecular formula of the first three members of the alkane hydrocarbons are CH_4,C₂H₆ and C₃H₈. What is the molecular formula for the eight alkane member, octane, which is found is petrol?

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C₈H₈

C₈H₁₆

C₈H₁₈

C₈H₂₀

The % age of carbon is lignite is

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60

70

80

90

Higher concentration of CO causes.

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Fatique

Headache

Both of them

None of them

Which base is more corrosive?

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NH₄OH

NaOH

Ca(OH)₂

AL(OH)₂

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