General Science
Potassium Permanganate is used for purifying drinking water, because

It is an oxidising agent.
It is a reducing agent
None of the listed here
It is a sterilising agent.

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General Science
Among the various allotrope of carbon

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

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