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Chemistry

Chemistry
The important ore of aluminium is

Cryolite
Bauxite
Fluorspar
Haematite

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Chemistry
Formic acid is produced by

Red ants
Cockroaches
White ants
Mosquitoes

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Chemistry
The first metal used by man was

gold
copper
bronze
iron

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Chemistry
Citric acid is present in free form in

Milk
Apple
Lemon
Tamarind

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Chemistry
The number of g-molecule of oxygen in 6.02 x 1024CO molecules is

0.5 gram of molecule
1 gram of molecule
10 gram of molecule
5 gram of molecule

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Chemistry
Which one of the following metals pollutes the air of a city having large number of automobiles?

Cadmium
Copper
Lead
Chromium

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