Which of the following is a necessary condition for spontaneous combustion to take place?

Flame is required.

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Spark is replied.

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The temperature of the substance should be increased to ignition temperature.

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Solution

The correct option is A The temperature of the substance should be increased to ignition temperature.
No flame or spark is required to start spontaneous combustion. It is only the rise in temperature to the ignition temperature which starts combustion of material producing heat and light energy.

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