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Chemistry

Chemistry
The gas which turns into liquid at the lowest temperature among the following is

Helium
Hydrogen
Nitrogen
Oxygen

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Chemistry
The metal used to recover copper from a solution of copper sulphate is

Fe
Na
Ag
Hg

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Chemistry
Which one of the following forms of phosphorus is most reactive?

White phosphorus
Black phosphorus
Red phosphorus
Violet phosphorus

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Chemistry
Which one of the following contains maximum percentage of carbon ?

Stainless steel
Wrought iron
High speed steel
Cast iron

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Chemistry
Which one is not a pure form of carbon

Diamond
Gold
Coal
Graphite

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Chemistry
White coal is

Uranium
Hydro-electricity
None of these
Diamond

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