The spontaneity means, having the potential to proceed without the assistance of an external agency. The processes which occur spontaneously are

(i) flow of heat from colder to warmer body.
(ii) gas in a container contracting into one comer.
(iii) gas expanding to fill the available volume.
(iv) burning carbon in oxygen to give carbon dioxide.

Answers (1)

The answer is option (iii) and (iv).

Explanation: Both the processes, namely, the filling of empty space by gas, as well as the burning of carbon which leads to a formation of carbon dioxide, are spontaneous processes.

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