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Why coal or petrol does not burn by itself in air but once initiated by flame, it continues to burn? Select the correct answer from above options

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Ea for the combustion reaction is very high for burning of coal but low for burning of petrol. Yet so much energy is not available at room temperature. On applying flame, a part of coal or petrol and air in contact with the flame absorb heat which provides the necessary Ea and combustion starts. The heat liberated further provides Ea for the combustion to continue.

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