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Chemistry

Chemistry
Which one of the following elements exhibits the greatest tendency to lose electrons ?

Zinc
Lithium
Fluorine
Oxygen

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Chemistry
The substance that is added to make natural rubber strong and more bouncy is

Chlorine
Polythene
Sulphur
Sponge

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

Methane emission
CFC emission
Carbondioxide emission
Deforstation

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Chemistry
Biofertilizers convert nitrogen to ________ .

Amino acids
Nitrates
Ammonia
Nitrogenase

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Chemistry
Which of the following laser types is used in a laser printer?

Semiconductor laser
Excimer laser
Dye laser
Gas laser

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Chemistry
Cement is usually a mixture of :

Lime stone and silicon dioxide
Calcium silicate and calcium ferrate
Calcium aluminate and calcium ferrate
Calcium silicate and calcium aluminate

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