Question

4. Define :
(a) Photochemical reaction (b) Electrochemical reaction.
Give one
example in each case.
cal​

Answer 1

Answer:

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Answer 2

Answer:

a.Photochemical reaction, a chemical reaction initiated by the absorption of energy in the form of light. The consequence of molecules' absorbing light is the creation of transient excited states whose chemical and physical properties differ greatly from the original molecules.

The example is photosynthesis.

b. An electrochemical reaction is a process in which electrons flow between a solid electrode and substance, such as an electrolyte. This flow triggers an electric current through the electrodes, causing the reaction to liberate or absorb heat. Zn(s)+2H+(aq)⟶Zn2+(aq)+H2(g) is a simple electrochemical reaction.

Explanation:

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