Question

Write chemical equations for following : (a) cinnabar is heated in presence of air (b) manganese dioxide is heated with aluminum powder​

Answer 1

a) cinnabar is HgS. The rection when it is kept for a long duration in air is

HgS+O2>>HgO+So2

HgO>>Hg+O2(HgO is unstable)

b)manganese dioxide us MnO2

MnO2+Al(powder)>>Mn+Al2O3

Answer 2

Answer:

2Hgs( s) +3O2 -----2HgO( s) +2SO2( g)

2HgO( s) -----2Hg(l) +02( g)