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Question

A substance that reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?​

A
iron nail​
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B
glass
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C
Stone piece
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D
wood
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Solution

The correct option is D wood
The substances that burn in presence of air to produce heat and light are called combustible substances. ​

Eg:- Wood, coal, charcoal, kerosene, petrol, diesel, liquified petroleum gas (LPG), compressed natural gas (CNG), etc.​

Substances like stone, glass, iron nails, etc. do not burn on being exposed to flame as they have high Ignition temperature. Such substances are called non-combustible substances.​

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