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Question

Classify the following as chemical change or physical change:
Passing of electric current through water and the water breaking down into hydrogen and oxygen gases.

Solution
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Passing of electric current through water and the water breaking down into hydrogen and oxygen gases is a chemical change because redox reaction takes place during the electrolysis of water.

Reaction:
$$\mathrm{2H_2O(l) \rightarrow 2H_2(g) + O_2(g)}$$

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