Question

Explain the preparation of Dioxygen​

Answer 1

Answer:

Dioxygen is prepared in the laboratory by thermal decompositions of oxygen-rich compounds such as KClO3, It is also prepared by the hydrolysis of sodium peroxide. Electrolysis of water also produces dioxygen in the pure state.

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Answer 2

$\textbf{\underline{\underline{PREPARATION:-}}}$

Dioxygen can be obtained in the laboratory by the following ways :--

✴️ By heating oxygen containing salts such as chlorates, nitrates and permanganates.

◻️2KClO3 ➡️ 2KCl + 3 O2

✴️ By the thermal decomposition of the oxides of metals low in the electrochemical series and higher oxides of some metals.

◻️ 2Ag2O (s) ➡️ 4Ag (s) + O2 (g)

◻️ 2HgO (s) ➡️ 2Hg (l) + O2 (g)

◻️ 2Pb3O4 (s) ➡️ 6PbO (s) + O2 (g)

◻️ 2PbO2 (s) ➡️ 2PbO (s)+ O2 (g)

✴️ Hydrogen peroxide is readily decomposed into water and dioxygen by catalysts such as finely divided metals and manganese dioxide.

◻️ 2H2O2 (Aq) ➡ ️2 H2O (l) + O2 (g)

✴️ On large scale it can be prepared from water or air. Electrolysis of water leads to the release of hydrogen at the cathode and oxygen at the anode.

◀️️ Industrially, dioxygen is obtained from air by first removing carbon dioxide and water vapour and then, the remaining gases are liquefied and fractionally distilled to give dinitrogen and dioxygen.

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