Cinnabar `(HgS)` and galena `(PbS)` on roasting often give their respective metals, but zinc blende `(ZnS)` does not. Give reason.

Cinnabar (HgS) and galena (PbS) on roasting. often given their respective metals, but zinc blende (ZnS) does not. Explain.

Cinnabar (HgS) and galena (PbS) on roasting often yield their respective metals but zinc blende (ZnS) does not. Explain with reason.

Cinnabar (HgS) and galena (PbS) on roasting give their respective metals but zinc blende does not. Explain.

Galena (PbS) and cinnabar (HgS) on roasting often give their respective metals but zinc blende (ZnS) does not. Explain.

Cinnabar (HgS) and galena (PbS) are converted into their respective metals on roasting but zinc blende (ZnS) does not. Explain with reason.

Zinc blende on roasting often gives Zn metal.

Zinc blende on roasting often gives Zn metal.

How is galena (PbS) present as impurity removed from the ore of zinc blende?