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Chemistry

Chemistry
Which amidst the following is not a gem stone ?

Topaz
Opal
Pearl
Cat's-eye

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Chemistry
Sulphur dioxide level in the atmosphere can be reduced by using

More efficient car engines
Static electricity to attract it in factory chimneys
Catalytic converters in industry
Low - sulphur fuels

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Chemistry
The ore of Aluminium is

Bauxite
Fluorspar
Chalco pyrites
Hematite

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Chemistry
The charcoal used to decolourise brown sugar solution is

Coconut charcoal
Wood charcoal
Sugar charcoal
Animal charcoal

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Chemistry
Sweat contains water and ________

Vinegar
Citric acid
Lactic acid
Salt

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Chemistry
The strongest oxidizing agent among the following is:

Chlorine
Fluorine
Iodine
Oxygen

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