Which of the following substances is not combustible?
A
Lead
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B
Petrol
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C
Sodium
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D
Paper
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Solution
The correct option is A
Lead
Explanation for the correct option:
A) Lead
Lead is a non-combustible substance.
The substances that do not catch fire in the presence of air or oxygen are called non-combustible substances.
The finely divided lead powder is flammable and gives off irritating or toxic gases in a fire.
Some other examples of non-combustible substances are carbon dioxide, stone, glass as well as water.
Explanation for the correct options:
B) Petrol
Petrol is a combustible substance.
Combustible substances are substances that burn quickly or catch fire quickly.
At temperatures as low as , the weak intermolecular interactions between the molecules of petrol allow the molecules to gather enough heat energy to leave as gas and create a combustible mixture with air. In the presence of an ignition source, this flammable mixture will catch fire.
C) Paper
Paper is a combustible substance.
Paper is combustible because it is formed from wood pulp, an organic substance that burns when air is present.
D) Sodium
Sodium is a combustible substance
Sodium reacts vigorously with air and water. It is an exothermic reaction that generates a lot of heat like fire. As a result hydrogen gas is evolved and sodium hydroxide is formed. Since hydrogen is extremely combustible, it immediately catches fire.
Hence. option (A) is correct. Lead is a non-combustible substance.