Which of the following sulphides can not be reduced to metal by at about ?

CHEMISTRY · Single correct · CBSE · Chemistry · Metals and Non-metals · Metals and Non-metals

Problem

Which of the following sulphides can not be reduced to metal by

\text{H}_2

at about

1000^\circ\text{C}

? (1) HgS (2) PbS (3)

\text{Bi}_2\text{S}_3

(4) all of these