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Chemistry

Chemistry
Total number of naturally occurring elements

62
98
92
110

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Chemistry
The maximum number of isomers for an alkene with molecular formula C4H8 is

4
5
3
2

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Chemistry
A balloon filled with helium rises in air because

The balloon is weightless
Helium pushes down on the air below the balloon
Air exerts an upward force on the balloon
Helium is less dense than air

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Chemistry
The water pollution in river is measured by the dissolved amount of

Nitrogen
Ozone
Oxygen
Chlorine

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Chemistry
Which one is the lightest element in the periodic table

Helium
Hydrogen
Carbon
Oxygen

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

n
n2
n-2
n3

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