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 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 2Na + Cl2 ↑
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Related Questions
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(a) Chemical change
(b) Chemical bond
(c) Effervescence
(d) Precipitate
Give an example of a reaction where the following are involved:
(a) Heat
(b) Light
(c) Electricity
(d) Close contact
(e) Solution
(f) Pressure
(g) Catalyst
Give an example of each of the following chemical changes.
(a) A photochemical reaction involving 1. silver salt 2. water
(b) A reaction involving 1. blue solution 2. formation of a dirty green precipitate
(c) Two gases combine to form a white solid.
(d) Two solids combine to form a liquid.
(e) A reaction where color change is noticed.
Write the chemical reaction where the following changes are observed.
(a) Gas is evolved
(b) Colour change is noticed
(c) Precipitate is formed
(d) Physical state of reactants is changed