Question

preperation of Dioxygen

Answer 1

Preparation of Dioxygen :-

Δ
2KClO3                      →              2KCl   + 3O2
MnO2

Another laboratory technique includes the thermal disintegration of metal oxides from the lower part of the electrochemical arrangement. For example, the thermal decomposition of mercuric oxide or silver oxide gives oxygen.

2HgO      →    2Hg     +   O2
Mercuric oxide        Δ     Mercury        Dioxygen

2Ag2O      →      4Ag     +   O2
Silver oxide         Δ      Silver        Dioxygen

We can also prepare oxygen in the laboratory by thermal treatment of the higher oxides of some metals like lead, manganese and barium.

2PbO2            →       2PbO                 +   O2
Lead (IV) oxide         Δ     Lead (II) oxide        Dioxygen

2MnO2          + 2H2SO4      →     2MnSO4         + 2H2O    + O2
Manganese       Sulphuric            Δ     Manganese        Water     Dioxygen
(IV) oxide                (II) sulphate

2BaO2                     →       2BaO                 +   O2
Barium peroxide             Δ     Barium oxide        Dioxygen

Salts that are rich in oxygen, such as permanganates and nitrates, when decomposed thermally also yields oxygen.

2KNO3       →          2KNO2         +         O2
Potassium nitrate             Potassium nitrite        Dioxygen

2KMnO4    → K2MnO4          + MnO2                    + O2
Potassium            Δ    Potassium        manganese             Dioxygen
permanganate         manganate                                         (IV) oxide

2NaNO3     →        2NaNO2         +    O2
Sodium nitrate             Δ      Sodium nitrate     Dioxygen

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