How will you prepare oxygen at the ordinary temperature in laboratory. Give the balanced overall reaction involved.

[3 Marks]

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Solution

Oxygen gas can be obtained by the electrolysis of water containing some acid or alkali. [1 Mark]

Oxygen is collected from the anode. [1 Mark]

Overall chemical reaction: [1 Mark]

$H_{2} O ⇌ H^{+} + O H^{-}$

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