How oxygen can be prepared from
Catalytic decomposition
From potassium chlorate
From water

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Solution

Catalytic decomposition of hydrogen peroxide:
In the laboratory, oxygen is prepared by catalytic decomposition of hydrogen peroxide in $(H_{2} O_{2})$ which manganese oxide $({MnO}_{2})$ is used as a catalyst to produce Hydrogen gas and oxygen gas.
$H_{2} O_{2} (l) \overset{{MnO}_{2}}{\to} H_{2} (g) + O_{2} (g)$
Thermal decomposition of potassium chlorate:
When potassium chlorate is heated in the presence of manganese oxide then it releases oxygen along with a by-product potassium chloride.
$2 {KClO}_{3} (s) \overset{∆, {MnO}_{2}}{\to} 2 KCl (s) + 3 O_{2} (g)$
Electrolysis decomposition of water:
When acidified water is subjected to electrolysis, chemical decomposition takes place which further evolves oxygen and hydrogen gases.
$2 H_{2} O (l) \overset{electrolysis}{\to} \underset{(Cathode)}{2 H_{2} (g)} + \underset{(Anode)}{O_{2} (g)}$

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