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Chemistry

Chemistry
Which component referred to as 'Milk sugar'?

Lactose
Maltose
Galactose
Sucrose

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Chemistry
Ruby and sapphire are oxides of

Copper
Tin
Iron
Aluminium

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Chemistry
Of the following, which one pollutes the air of a big city ?

Cadmium
Chromium
Copper
Lead

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

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

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Chemistry
The percentage of oxygen in air is approximately

0.01
1
0.78
0.21

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Chemistry
The purest form of water in nature is

River water
Rain water
Sea water
Lake water

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MORE MCQ ON Chemistry

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