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Question

Which among the following is non-combustible in nature?

A
LPG
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B
Petrol
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C
Chalk
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D
Paper
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Solution

The correct option is C Chalk
Substances which burn or undergo combustion are called combustible substances. While, substances which do not burn are called non-combustible substances.
LPG, petrol and paper burn on coming in contact with fire. So, they are combustible in nature. Whereas, chalk does not burn. Hence, it is a non-combustible substance.

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