Question

why does a heap of coal or wood not catch fire at room temperature through surface quantity of oxygen is present in the air ​

Answer 1

Two conditions have to be met so that the fuel catches fire:

i) Presence of sufficient oxygen

ii) surrounding temperature should be above ignition temperature.

Here though sufficient oxygen is present but the surrounding temperature is lower than the ignition temperature.

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Answer 2

because its ignition temperature is very high