For the combustion of carbon, ΔH = -ve and ΔS = +ve and hence, thermodynamically the process is spontaneous at all temperatures. But coal stored in coal depots does not burn automatically because of

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Prashant Kotian · Accepted Answer

Correct answer: A. While thermodynamically favored, combustion of coal does not occur automatically at room temperature because it requires a very high activation energy (threshold energy barrier) to initiate the breaking of bonds. Therefore, correct answer is A.

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