When we heat an empty paper cup it catches fire easily. But when we try to heat a paper cup with water, it does not catch fire. When we add water into the paper cup, its ignition temperature _____.

None of the above

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increases

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remains constant

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decreases

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Solution

The correct option is B increases
The lowest temperature at which a substance catches fire is called its ignition temperature.

The heat supplied to the paper cup is transferred to the water by conduction. So, in the presence of water, the ignition temperature of paper is not reached. Hence, it does not burn.

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