Which of the following is a non-combustible substance?

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Coal

Wood

Paper

Iron nail

answer is A.

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Detailed Solution

Iron nail is a non-combustible substance.

Non-combustible substances are those which do not burn when exposed to fire. Iron nail does not burn, but it melts when exposed to fire. Wood, paper, and coal burn when exposed to fire. So, the correct answer is- 'Iron nail'.

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Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE