Question: 16 - If copper is kept in open air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of
Answer: (d) CuO
Question: 17 - Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?
Answer: (d) Hg
Question: 18 - Which of the following metals are obtained by electrolysis of their chlorides in molten state?
Answer: (d) (i) and (ii)
Question: 19 - Generally, non-metals are not lustrous. Which of the following nonmetal is lustrous?
Answer: (d) Iodine
Question: 20 - Which one of the following four metals would be displaced from the solution of its salts by other three metals?
Answer: (b) Ag
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