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Chemistry

Chemistry
Which one is the most reactive gaseous element

Chlorine
Flourine
Iodine
Bromine

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Chemistry
Which of the following is the best fuel in terms of energy released per gram of fuel?

Methane
Butane
Hydrogen
Ethanol

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Chemistry
Heating of a ore below its melting point in the absence of air is known as

Smelting
Roasting
Refining
Calcination

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

Pb
Cu
Ni
Pt

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Chemistry
Which of the following metals form an amalgam with other metals ?

Zinc
Mercury
Lead
Tin

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Chemistry
Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful

Solar ultraviolet radiation
Solar infrared radiation
SO2 in the air
CO2 in the air

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