General Science
When an iron nail gets rusted, iron oxide is formed

With decrease in the weight of the nail
Without any change in colour or weight of the nail
Without any change in the weight of the nail
With increase in the weight of the nail

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General Science
Among the various allotrope of carbon

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

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