The following table classifies substances into combustible and non-combustible substances. CombustibleNon-combustibleCoalGlassPaperCow dung cake HydrogenChalk Which of the above entries is not listed correctly?
A
Chalk
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B
Hydrogen
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C
Glass
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D
Cow dung cake
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Solution
The correct option is D Cow dung cake ∙ Combustion is a chemical process in which a substance reacts with oxygen to generate heat. ∙ The substances that undergo combustion are called combustible substances and those that do not undergo combustion are called non-combustible substances. ∙ Since, cow dung cake undergoes combustion, it is a combustible substance. Hence, it is listed incorrectly in the table.