Question

$HgO\left(s\right)\stackrel{Heat}{\to }Hg\left(l\right)+O_2\left(g\right)$
The above given reaction is:

• A. combustion reaction
• B. displacement reaction
• C. thermal decomposition reaction
• D. photolytic decomposition reaction

Answer 1

Answer: (C)

thermal decomposition reaction

Mercuric oxide ($HgO$) decomposes on heating to give mercury ($Hg$) and oxygen ($O_2$). It is a thermal decomposition reaction and the balanced equation can be written as:
$2HgO\left(s\right)\stackrel{heat}{\to }2Hg\left(l\right)+O_2\left(g\right)$