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Q.

Burning of sodium in the air is an example of ______________________.

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a

Rapid combustion

b

Explosion

c

Slow combustion

d

Spontaneous combustion

answer is B.

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Detailed Solution

Burning of sodium in the air is an example of spontaneous combustion.

A type of combustion in which the substance suddenly catches fire without the supply of heat or friction externally is called spontaneous combustion. When sodium is exposed to air it immediately catches fire and requires no external heat,  so it is an example of spontaneous combustion.

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