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Chemistry

Chemistry
The gas liberated in the Bhopal gas tragedy was:

Pheynl isocynate
Acetylene
Ethylene
Methyl isocynate

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Chemistry
Which of the following is secondary air pollutant ?

Dust particles
SO2
Photochemical smog
NO2

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Chemistry
Lead pencil contains

Lead sulphide
Ferrous sulphide
Lead
Graphite

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Chemistry
The manufacturing of iron from iron ore involves the process of

Electrolysis
Fractional distillation
Reduction
Oxidation

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Chemistry
The most abundant element by number in the living system is :

Oxygen
Nitrogen
Carbon
Hydrogen

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Chemistry
Brass is a solution of molten copper in

Molten zinc
Molten tin
Gaseous zinc
Solid zinc

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