Dear student,
A process which takes  place by itself, without any external aid under the given conditions is  called a spontaneous process. It may require  initiation. 
Examples: (i) Flow of heat from a body at a higher temperature to a  body at a lower temperature.
(ii) Movement of gas molecules from the region of  higher pressure to a region of lower pressure.
(iii) Flow of water from a higher level to a  lower level etc., are spontaneous physical processes.
(iv) Reaction between zinc and sulphuric acid to  produce zinc sulphat{e} and hydrogen. (Zn + H2S04 -> ZnS04 + H2).
(v) Reaction between an acid and base to produce  salt and water etc. are spontaneous chemical processes. ( NaOH + HC1  NaCl + H20).
 






























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