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2. Electrolytic decomposition of water is a reaction involving change of state. Answer: Electrolysis of water is the decomposition of water into hydrogen and oxygen due to the passage of electric current through it. A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution
3. when an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.
5. Silver chloride is a light-sensitive chemical compound andit easily undergoes photolytic decomposition reaction. Silver chloride decomposes into silver and chlorine gas when exposed to sunlight. Hence Silver chloride is stored in dark-colored bottles.
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