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Chemistry

Define :

(a) Photochemical reaction

(b) Electrochemical reaction.

Give one example in each case.

Chemical Reaction

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Answer

(a) A chemical reaction that takes place by the action of light is called a photochemical reaction.

Example —

2AgNO3 sunlight\xrightarrow{\text{sunlight}} 2Ag + 2NO2 ↑ + O2

(b) Reactions that are caused or accompanied by the passage of an electric current are called electrochemical reaction.

Example — On passing current through through molten sodium chloride, sodium and chloride are obtained separately.

2NaCl electricity\xrightarrow{\text{electricity}} 2Na + Cl2

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