Question # 1

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 colour of litmus in a strong basic solution become.

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Yellow

Blue

Red

Colourless

Coal is the mixture of

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Hydrogen

Methane

Carbon monoxide

All

The reaction in which the products can recombine to form reactants are called.

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Reversible reaction

Irreversible reaction

Decomposition

Addition

Ozone id beneficial for us as it:

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absorbs infrared radiations

absorbs ultraviolet radiation

absorbs chlorofluorocarbons

absorbs air pollutants

Which gas protects the Earth's surface from ultraviolet radiations?

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CO₂

CO

N₂

O₃

Extraction of metals from its ores is called.

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Metallurgy

Mining

Griding

All

Which of the following is reducing sugar?

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Glucose

Maltose

Sucrose

Starch

A sea level the boiling point of water is.

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0^oC

98^oC

100^oC

110^oC

The end product of oxidation of acetylene is.

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Propen glycol

Ethan glycol

Glyoxal

Oxalic acid

75% atmosphere mass lies in how many kilometers.

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11 km

30 km

50 km

85 km

Depending upon temperature variation, atmosphere ins divided into how many regions?

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1

2

3

4

Which one of the ore of copper?

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Copper glance

Chalcopyrite

Both a and b

None of these

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