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Chemistry

Chemistry
Among the following the hardest metal is

Gold
Tungsten
Platinum
Iron

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Chemistry
Which one of the following chemicals helps in fruit ripening?

Malathion
Atrazine
Ethephon
Isoproturan

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Chemistry
A metal is exposed to the atmosphere for sometime. It becomes coated with green carbonate. The metal must be

Silver
Zinc
Copper
Aluminium

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Chemistry
Dry ice is the solid form of :

Air
Nitrogen
Carbon di–oxide
Water

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Chemistry
The quality of petrol is expressed in terms of

Added unlead compounds
Gold number
Cetane number
Octane number

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Chemistry
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is

carbon
oxygen
hydrogen
nitrogen

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