Solved papers for JEE Main & Advanced JEE Main Paper (Held On 11 April 2015)

done JEE Main Paper (Held On 11 April 2015) Total Questions - 2

• question_answer1) When concentrated HCl is added to an aqueous solution of \[CoC{{l}_{2}},\]its colour changes from reddish pink to deep blue. Which complex ion gives blue colour in this reaction? [JEE Main Online Paper (Held On 11 April 2015)]  
  A)
  \[{{[CoC{{l}_{6}}]}^{4-}}\]
  done clear
  B)
  \[{{[CoC{{l}_{6}}]}^{3-}}\]
  done clear
  C)
  \[{{[CoC{{l}_{4}}]}^{2-}}\]
  done clear
  D)
  \[{{[Co{{({{H}_{2}}O)}_{6}}]}^{2+}}\]
  done clear
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• question_answer2) Which of the following complex ions has electrons that are symmetrically filled in both \[{{t}_{2g}}\]and \[{{e}_{g}}\] orbitals? [JEE Main Online Paper (Held On 11 April 2015)]  
  A)
  \[{{[Co{{F}_{6}}]}^{3-}}\]
  done clear
  B)
  \[{{[Co{{(N{{H}_{3}})}_{6}}]}^{2+}}\]
  done clear
  C)
  \[{{[Mn{{(CN)}_{6}}]}^{4-}}\]
  done clear
  D)
  \[{{[Fe{{F}_{6}}]}^{3-}}\]
  done clear
  View Answer play_arrow