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Chemistry

Chemistry
Which type of radiations are absorbed by the upper layer of the atmosphere?

Infrared
Visible
Ultraviolet
Radio-waves

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Chemistry
Haloarenes are more stable than haloalkanes due to

Resonance effect
Hyper conjugative effect
All of them
Inductive effect

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Chemistry
Formation of ozone hole is maximum over

Europe
India
Antarctica
Africa

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Chemistry
Green house effect is accelerated by

Deforestation
All of these
Increased transportation activity
Rapid industrialization

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Chemistry
Which variety of coal contains recognisable traces of the original plant material ?

Peat
Anthracite
Lignite
Bitumen

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Chemistry
Which is the purest form of iron?

Pig iron
Cast iron
Steel
Wrought iron

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