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Chemistry

Chemistry
Forth floatation process to concentrate the minerals is applicable to

Bauxite
Calamine
Haematite
Chalcopyrites

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Chemistry
The metal that is used as a catalyst in the hydrogenation of oils is

Pt
Pb
Ni
Cu

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Chemistry
The percentage of oxygen in air is approximately

1
0.01
0.21
0.78

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Chemistry
The third shell of an atom can have a maximum of ______ electrons

21
15
13
18

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Chemistry
Which of the following is not a natural source of hydrocarbon?

Coal
Petroleum
Mica
Natural Gas

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Chemistry
For extinguishing fire, we use

Carbon Dioxide
Hydrogen
Marsh gas
Carbon Monoxide

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