Question

Which of the following compounds turns white on treatment with H2O2 ?

• A. HgS
• B. PbS
• C. NiS
• D. CuS

Answer 1

Answer: (B)

PbS

Answer 2

PbS reacts with H2O2 to give white PbSO4

PbS + 4H2O2 $\longrightarrow$PbSO4 + 4H2O

Black                White