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

Chlorine
Bromine
Sulphur
Fluorine

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General Science
Among the various allotrope of carbon

Diamond is the hardest, coke is the softest
Diamond is the hardest, lamp black is the softest
Diamond is the hardest, graphite is the softest
Coke is the hardest, graphite is the softest

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