Question # 1

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

Which element protects teeth from decay?

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Potassium

Fluorine

Sodium

Calcium

Carbonization process is the conversion of

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Coal into coal gas

Coal into wood

Wood into coal

Wood into coal tar

Low sugar level in human body result in.

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Hyperglycemia

Hypoglycemia

Anemia

All of them

Volatility of hydrocarbons deceases with:

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decrease of molecular mass

increase of molecular mass

increase of double or triple bonds

decrease of triple bonds

If an organic compound has 4 carbon atoms, all singly bonded, it will have the following characteristics except one.

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It will be saturated hydrocarbon

It will hav 8 hydrogen atoms

Its name will be n-butane.

It will be least reactive.

Which pollutant is responsible for changing weather?

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Air pollutant

Water pollutant

Soil pollutant

All of them

Thermosphere lies beyond.

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Stratosphere

Troposphere

Mesosphere

Biosphere

The nitrogen present in urea is used by plants to synthesize.

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Sugar

Proteins

Fats

DNA

Which is the main component of natrual gas.

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Methane

Ethane

Propane

Charcoal

Temporary hardness is due to the presence of bicarbonates of.

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Calcium

Magnsium

Both of them

None of them

How many percent of natural gas is consisted of methane.

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60%

70%

80%

85%

Which one is homocyclic compound?

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Benzene

Cyclobutane

Cyclohexane

All

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