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Chemistry

Chemistry
Periodic table contains how many periods

10
7
6
8

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Chemistry
The process which does not evolve CO2 in air is

Organic delay
Photosynthesis
Burning
Breathing

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Chemistry
Which of the following acts as promoter for iron in Haber's process

Mn
W
Mg
Mo

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Chemistry
The pollutant responsible for ozone holes is ________

CO
CFC
CO2
SO2

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Chemistry
Carborundum is another name of

Calcium carbide
Calcium oxide
Silicon oxide
Silicon carbide

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Chemistry
Which one of the following is not a cause for present global warming and climate change ?

Deforstation
Carbondioxide emission
Methane emission
CFC emission

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