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Chemistry

Chemistry
Which of the following is used in making smoke bombs?

Hydrogen
Carbon
Phosphorus
Sulphur

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Chemistry
Which of the following metals is not a pollutant ?

Lead
Aluminium
Mercury
Arsenic

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Chemistry
Litmus is obtained from

Lichen
A bacterium
A fungus
An alga

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Chemistry
Which one is a sublime substance?

Sugar
Potassium Iodide
Table salt
Iodine

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Chemistry
The number of waves in n x 10th Bohr's orbit are

n
n3
n-2
n2

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Chemistry
Activated Charcoal is used to remove colouring matter from pure substances by

Reduction
Adsorption
Bleaching
Oxidation

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