Substance 'X' suddenly bursts into flames at room temperature, while substance 'Y' burns after a prolong heating. Which of the following are true about 'X' and 'Y'?

Substance 'X' goes spontaneous combustion

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Substance 'Y' goes spontaneous combustion

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Ignition temperature of 'X' is less than 'Y'

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Ignition temperature of 'X' is more than 'Y'

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Solution

The correct options are
A Substance 'X' goes spontaneous combustion
C Ignition temperature of 'X' is less than 'Y'
Spontaneous combustion is the one in which a substance starts burning without any heat provided to it. In te given experiment substance X bursts into flames when kept in contact with air at room temperature. Hence, it represents spontaneous combustion. While subsatnce burns after a prolonged heating, so it does no show spontaneous combustion.
The lowest temperature at which a substance catches fire is called its ignition temperature. Substance X catches fire at the room temperature but Y does not. When substance Y is heated, Y catches fire after the ignition temperature of Y is reached. Hence, ignition temperature of Y is more than of X.

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