General Science
The chemical (Ethyl Mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of

Bromine
Fluorine
Chlorine
Sulphur

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General Science
Amalgams are

Alloys which have great resistance to abrasion
Alloys which contain mercury as one of the contents
Alloys which contain carbon
Highly coloured alloys

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