How will you prepare oxygen at the ordinary temperature in laboratory? Give a balanced equation for the reaction. [2 marks]

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Solution

Pure oxygen can be obtained by the electrolysis of water containing some acid or alkali. Oxygen is collected from the anode. [1 mark]

Preperation of Oxygen from acidulated water

Chemical reaction: [1 Marks]

$2 H_{2} O (l) \to 2 H_{2} (g) + O_{2} (g)$

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