Q71 of 400 Page 194

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:

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 basic copper carbonate.

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69 The two metals which are extracted by means of electrolytic reduction of their molten salts are : 70 In stainless steel alloy, iron metal is mixed with 72 Which of the following alloys contains mercury as one of the constituents? 73 Which of the following is an ore of mercury metal?

Options||A. rock salt


B. cinnabar


C. calamine


D. haematite