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The spontaneity means having the potenti...

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

A

flow of heat from colder to warmer body

B

gas in a container contracting into one corner

C

gas expanding to fill the available volume

D

burning carbon in oxygen to give carbon dioxide

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The correct Answer is:
C, D
Options (a) and (b) can be neither occur by themselves nor by initiation, (c) can occur by itself, (d) occur on initiation. Flowing of heat from warmer to colder body, expanding of gas and buring of carbon to give carbon dioxide, all are spontaneous process.
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