Why is oxygen collected over mecury
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When mercuric oxide is strongly heated in a hard glass tube, it decomposes, globules of mercury collect in the cooler part of the tube and oxygen gas is evolved. It may be collected over mercury in a pure and dry state. ... Many higher oxides of metals decompose on heating forming the lower oxides and oxygen gas.
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Answer:When mercuric oxide is strongly heated in a hard glass tube, it decomposes, globules of mercury collect in the cooler part of the tube and oxygen gas is evolved. It may be collected over mercury in a pure and dry state. ... Many higher oxides of metals decompose on heating forming the lower oxides and oxygen gas
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