Question # 1

Coal having 90% carbon contents is called.

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Peat

Lignite

anthracite

bituminous

Arrhenius put forward acid base concept in.

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1878

1786

1787

1790

Fossil fuel means.

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Coal

Petroleum

Natural gas

All of them

Which acid is used for food preservation?

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Hydrochloric acid

Benzoic acid

Sulphuric acid

Nitric acid.

Ozone layer is not found is

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Upper stratosphere

Mid stratosphere

Lower stratosphere

All of them

The Earth's atmosphere is getting hotter because of.

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Increasing concentration of CO

Increasing concentration of CO₂

Increasing concentration of O₃

Increasing concentration of SO₂

Clark's method is used to remove the hardness of water, in this method which is used.

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Ca(HCO₃)₂

Na-Zeolite

Ca-Zeolite

Ca(OH)₂

The process which convert vegetable oil into banaspati ghee called.

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Hydrogenation

Halogenation

a and b

None of these

Permanent hardness is removed by adding.

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Na₂ zeolite.

Soda lime

Lime water

Quick lime

When the numbers of moles of both sides are equal in a reaction, then the unit of K_c will be:

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No unit

mol^-2 dm⁶

mol dm³

mol^-2dm

Molecular formula of butane is

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C₄H₈

C₄H₁₀

C₄H₁₂

C₄H₆

Which one of the following is not air pollutant.

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CO₂

CO

NO₂

O₂

Petroleum is refined by:

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destructive distillation

fractional distillation

simple distillation

dry distillation

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