Question # 1

Concentration of the copper ore is carried out by:

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Calcinations

Roasting

Forth flotation

Distillation

In laboratory urea was prepared by

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Wohler

Rutherford

Berzelius

Dalton

Infrared radiations emitted by the Earth are absorbed by.

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CO₂ and H₂O

N₂ and O₂

CO₂and N₂

O₂and CO₂

The % age of carbon is coal is

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40-60

50-70

40-80

40-90

According to Lewis concept, acid is a substance which.

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Can donate protons

Can donate an electron pair

Can accept protone

Can accept electron pair

Which one is not a characteristic of an acid:

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it turns red litmus blue

it reacts with base to form salt and water

Its aqueous solution conduct electric current

it has sour taste

Alkanes are produced in large amounts by cracking of

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Natural gas

Petroleum

Benzene

Xylol

The percentage of SO₂released by the combustion of coal and petroleum product.

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40%

60%

70%

80%

Hook warm larvae enter the body through.

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Food

Water

Skin

All of them

If Qc > Kc the reaction will be in

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Chemical equilibrium

Static equilibrium

Reverse reaction

Forward reaction

Inland water includes.

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River

Lakes

Streams

All of them

Which one of the followoing is the Hardest coal.

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Peat

Lignite

Bituminous

Anthracite

Which compound protect teeth from diseases?

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Fluorine compound

Chlorine compound

Iodine compound

Bromine compound

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