Question

Which type of reaction occurs in the following? 2HgO(s) 2Hg(l) + O2(g)


A.a decomposition reaction in which a metal is reduced
B.an acid-base neutralization reaction to produce oxygen gas
C.a displacement reaction involving two metals
D.a combustion reaction involving burning a metal in oxygen

Answer 1

A.a decomposition reaction

Answer 2

In this reaction, reactant HgO decomposes into more than one products hence reaction is called decomposition.Hg in HgO has oxidation number of +2 whereas oxidation number of Hg in product side is zero( zero because Hg is in its elemental form) so Hg is reduced. Hence A is correct option.