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Chemistry

Chemistry
An example of replenishable energy source is–

Biomass
Coal
Lignite
Petroleum

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Chemistry
Highest percentage of carbon is found in which form of coal?

Lignite
Bituminous
Peat
Anthracite

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Chemistry
The first metal used by a man was

Silver
Copper
Brass
Bronze

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Chemistry
Which one of the following was used as a chemical weapon in the first world war ?

Carbon monoxide
Mustard gas
Water gas
Hydrogen cyanide

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Chemistry
The first organic compound synthesised in the laboratory was

Urea
Glucose
Lactic acid
Uric acid

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Chemistry
The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

5x
7.2 x
x/6
5x/36

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