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Question

The substance which undergoes combustion is called ________.
  1. fuel
  2. combustible
  3. Both A & C
  4. non-inflammable

A
non-inflammable
B
Both A & C
C
fuel
D
combustible
Solution
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The substance that undergoes combustion is said to be combustible. It is also called fuel. During combustion, a chemical change occurs. The substance reacts with oxygen and releases heat. Hence, the substance acts as fuel. A combustible substance is one that readily undergoes combustion.

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