Question

How is oxygen prepared by thermal decomposition of certain metallic oxides?

Answer 1

Answer:

Mercury(II) oxide, a red solid, decomposes when heated to produce mercury and oxygen gas. ... A metal carbonate decomposes into a metal oxide and carbon dioxide gas. For example, calcium carbonate decomposes into calcium oxide and carbon dioxide.

Answer 2

Dear Student,

◆ Preparation of oxygen from metallic oxides -

• Different metal oxides when heated at sufficient temperature, decompose into respective metal and oxygen.

For example,

• HgO on thermal decomposition at 500 ℃ gives oxygen.

2HgO --> 2Hg + O2

• BaO2 on thermal decomposition at 700 ℃ gives oxygen.

2BaO2 --> 2BaO + O2

• Li2O2 on thermal decomposition at 195 ℃ gives oxygen.

2Li2O2 --> 2Li2O + O2

Thanks dear. Hope this helps you...