Which of the following is an ore of mercury metal?

Options||A. rock salt

B. cinnabar

C. calamine

D. haematite

71 If copper is kept exposed to damp air for a considerable time, it gets a green coating on its surface. This is due to the formation of: 72 Which of the following alloys contains mercury as one of the constituents? 74 Calamine ore can be used to extract one of the following metals. This metal is: 75 Which of the following pair of metals exists in their native state in nature?