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Chemistry

Chemistry
The electronic configuration of an atom having atomic number ‘20’ is

2, 8, 8, 2
2, 6, 8, 4
2, 8, 10
2, 10, 8

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Chemistry
Petroleum consists of a mixture of

Hydrocarbons
Carbonates
Carbohydrates
Carbides

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Chemistry
Particulates (< 1 µm size) remaining suspended in air indefinitely and transported by wind currents are called

Aerosols
Fumes
Smoke
Mists

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Chemistry
Who is known as the 'father of modern chemistry'

Democritus
John Dalton
Antoine Lavoisier
Robert Boyle

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Chemistry
Which is the heaviest metal among the following?

Copper
Silver
Iron
Gold

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Chemistry
Helium gas is used in gas balloons instead of hydrogen gas because it is

More abundant than hydrogen
Non-combustible
More stable
Lighter than hydrogen

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