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Chemistry

Chemistry
Biofertilizers convert nitrogen to ________ .

Nitrogenase
Nitrates
Ammonia
Amino acids

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Chemistry
The percentage of oxygen in air is approximately

0.21
0.78
0.01
1

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Chemistry
The main active constituent of tea and coffee is

nicotine
caffeine
aspirin
chlorophyll

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Chemistry
Which method will be employed to test the hardness of water?

Distillation
None of these
Boiling
Formation of lather with soap

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Chemistry
Which of the following is an iron ore ?

Nitrite
Magnetite
Bauxite
Lignite

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Chemistry
The gas liberated in the Bhopal gas tragedy was:

Ethylene
Acetylene
Methyl isocynate
Pheynl isocynate

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