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Air — CHEMISTRY STD 7 — Question

ICSE BoardEnglish MediumSTD 7CHEMISTRYAir1 Mark
Question
How did Priestley prepare oxygen ?
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Answer

Priestley by prepared oxygen by heating mercury (II) oxide using the infra red rays of the sun.
$\begin{array}{c}2 HgO \\ \text { mercury (II) oxide }\end{array} \xrightarrow{\text { heat }} \underset{\text { mercury }}{2 Hg }+\underset{\text { oxygen }}{ O _2}$

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