Solved papers for JEE Main & Advanced JEE Main Paper (Held On 12 April 2014)

done JEE Main Paper (Held On 12 April 2014) Total Questions - 1

• question_answer1) Copper becomes green when exposed to moist air for a long period. This is due to: [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  the formation of a layer of cupric oxide on the surface of copper.
  done clear
  B)
  the formation of a layer of basic carbonate of copper on the surface of copper.
  done clear
  C)
  the formation of a layer of cupric hydroxide on the surface of copper.
  done clear
  D)
  the formation of basic copper sulphate layer on the surface of the metal.
  done clear
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