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Air and Atmosphere — CHEMISTRY STD 7 — Question

ICSE BoardEnglish MediumSTD 7CHEMISTRYAir and Atmosphere1 Mark
Question
What happens when the mercuric oxide is heated?
✓

Answer

$
\begin{array}{c}
\text { Mercuric oxide } \xrightarrow{\text { heating }} \text { Mercury }+ \text { Oxygen } \\
2 HgO \longrightarrow 2 Hg + O _2
\end{array}
$
Action of heat on mercuric oxide: Mercuric oxide is a red powder. When it is heated in a test tube, it decomposes to give mercury and oxygen.

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