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Chemistry

Chemistry
The highest volume of gases in lower atmosphere is comprised of

Oxygen
Nitrogen
Carbon dioxide
Hydrogen

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Chemistry
The drug ‘Marijuana’ is a

Sedative
Mental stimulant
Hallucinating substance
Tranquillizer

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Chemistry
Oxygen has (+) oxidation number only in

N2O
H2O (2)
C12O
OF2

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Chemistry
What is the element that is in the highest percentage in the composition of the earth ?

Silicon
Magnesium
Oxygen
Iron

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Chemistry
Total number of halogen elements found in the periodic table is

13
5
8
3

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Chemistry
Which of the following gases will effuse out of football bladder most quickly ?

N 2
O2
H2
He

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