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Chemistry

Chemistry
The gas used in the manufacture of vanaspati from vegetable oil is

carbon dioxide
oxygen
nitrogen
hydrogen

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Chemistry
The hydronium ion is

H+
H3O+
HO -
H2+

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Chemistry
Many people died in London in 1952 as result of air pollution producing

Fog
Mist
Sleet
Smog

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

Semiconductor laser
Gas laser
Dye laser
Excimer laser

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Chemistry
Aluminium can be purified by

Distillation
Electrolysis
Oxidation
Ozonolysis

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Chemistry
Food cans are coated with tin and not with zinc because

Zinc is less reactive than tin
Zinc is costlier than tin
Zinc is more reactive than tin
Zinc has a higher melting point than tin

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