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Chemistry

Chemistry
Which one is the lightest element in the periodic table

Oxygen
Helium
Carbon
Hydrogen

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Chemistry
Percentage of carbon in steel ranges from

1.5 to 3.0
4.0 to 6.0
0.1 to 1.5
3.0 to 4.0

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Chemistry
Which one among the following is not a mixture?

Brass
Graphite
Glass
Steel

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Chemistry
The pollutant responsible for ozone holes is ________

CO2
CFC
SO2
CO

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Chemistry
Which of the following compounds is commonly used as an antiseptic in mouthwashes and toothpastes ?

Sodium chloride
Hydrogen peroxide
Saltpetre
Borax

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Chemistry
Glycol is added to aviation gasoline because it

Reduces evaporation of petrol
Prevents freezing of petrol
Increases efficiency of petrol
Reduces consumption of petrol

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