Q. Describe what happens when hydoxide gas is passed over hot lead oxide?
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Answer:
2Pb3O4→6PbO+O2
Explanation:
There are two oxides for lead. One is lead(II) oxide, another one is lead (IV) oxide.
Lead (IV) oxide is thermally unstable and it tends to decompose into lead(II) oxide and oxygen upon heating.
2PbO2→2PbO+O2
Whereas when lead(II) oxide is heated to around 450-480 °C, it forms lead(II,IV) oxide, also known as red lead or triplumbic tetroxide.
6PbO+O2→2Pb3O4
If it is heated above 480 °C, reverse reaction will occur.
2Pb3O4→6PbO+O2
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