Question # 1

How much amount of sunlight reaches up to earth and absorbed:

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26%

32%

50%

18%

Which salt is used as a table salt?

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NaCl

Na₂CO₃

Na₂SiO₃

NaCl

75% atmosphere mass lies in how many kilometers.

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11 km

30 km

50 km

85 km

Which is used to remove the grease stains from clothes?

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NaOH

KOH

Al(OH)₃

NH₄OH

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

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40%

60%

70%

80%

Density of water at 4°C is:

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0.976 gem-3

1 gem-3

0.956 gem-3

1.1 gem-3

The impurities associated with the minerals are known as:

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Metallurgy

Ores

Gangue

Compounds

The raw materials for the manufacturing of urea are.

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Ammonia

Carbondioxide

Limestone

a & b

Deficiency of Vitamin E causes.

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rickets

Scurvy

Anemia in babies

Night blindness.

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

Which one the following is more reactive?

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Methane

Ethane

Ethene

Acetylene

The reaction in which the number of moles reactants and products not equal in balance chemical equation the units of Kc for this reactions are

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mol^-2

dm³

mol²

mol dm^-1

Boiling point of alcohol in centigrade is.

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68

78

118

128

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