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Chemistry

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

Bituminous
Peat
Anthracite
Lignite

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Chemistry
Interveinal necrotic spots on leaves appear due to

NO2injury
HF injury
SO2injury
O3injury

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Chemistry
An important green-house gas other than methane being produced from the agricultural fields is

Arsine
Nitrous oxide
Sulphur dioxide
Ammonia

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Chemistry
Commercial Vaseline is derived from

Petroleum
Coal tar
Plant gums
Wool wax

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Chemistry
Which component referred to as 'Milk sugar'?

Sucrose
Galactose
Lactose
Maltose

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Chemistry
The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

1/6
1/4
1/3
1/8

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