ICSE Class 9 Chemistry Question 15 of 18

Chemical Changes & Reactions — Question 5

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5
Question

Question 4.2

Differentiate between the following :

Electrolytic decomposition & photochemical decomposition

Answer
Electrolytic decompositionPhotochemical decomposition
A decomposition reaction which is brought about by passage of electric current is known as Electrolytic decomposition.A decomposition reaction which occurs in the presence of light is known as Photochemical decomposition.
For example:
2H2O ⟶ 2H2 + O2 (On Passage of Electric Current)
For example:
2AgCl ⟶ 2Ag + Cl