Question

In which of the following reaction color changes from red to yellow:
a) 2Hgo→2Hg+O2 b)PbCO3→PbO+CO2
c)MgCO3→MgO+CO2 c) 2Pb3O4→6PbO+O2

Answer 1

Answer:

d) 2Pb3O4→6PbO+O2

Explanation:

2Pb3O4→6PbO+O2

Minium is the naturally occurring form of lead tetroxide, Pb3O4 also known as red lead. Lead(II) oxide, yellow, also called lead monoxide, is the inorganic compound with the molecular formula PbO.

a) Mercury(II) oxide, also called mercuric oxide or simply mercury oxide, has a formula of HgO. It has a red or orange color. But Hg is not yellow.

b), c) PbCO3 and MgCO3 are white.