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Which of the following gives dioxygen an...

Which of the following gives dioxygen and metal on heating?

A

`BaO_(2)`

B

`Ag_(2)O`

C

`MnO_(2)`

D

`Pb_(3)O_(4)`

Text Solution

Verified by Experts

The correct Answer is:
2
We can obtain dioxygen by
(i) thermal decomposition of the oxides of matel which are low in the electrochemical series: `2HgOoverset(450^(@)C)rarr2Hg+O_(2)`
`2Ag_(2)O overset(350^(@)C)rarr4Ag+O_(2)`
(ii) the thermal deocmpositonof higer oxides: `2Pb_(3)O_(4)overset(Delta)rarr6PbO+O_(2)`
`2PbO_(2)overset(Delta)rarr2PbO+O_(2)`
`3MnO_(2)overset(Delta)rarrMn_(3)O_(4)+O_(2)`
(iii) the thermal decomposition of peroxides:
`2BaO_(2)overset(Delta)rarr2BaO+O_(2)`
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