Solved papers for JEE Main & Advanced AIEEE Solved Paper-2004

done AIEEE Solved Paper-2004 Total Questions - 6

• question_answer1) In  a  hydrogen-oxygen  fuel  cell, combustion of hydrogen occurs to
  A)
  generate heat
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  B)
  create potential difference between the two electrodes
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  C)
  produce high purity water
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  D)
  remove adsorbed oxygen from electrode surfaces
  done clear
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• question_answer2) Consider the following\[E{}^\circ \]values \[E{{{}^\circ }_{F{{e}^{3+}}/F{{e}^{2+}}}}=+0.77\,V\] \[E{{{}^\circ }_{S{{n}^{2+}}/Sn}}=-0.14\,V\] Under standard conditions the potential for the reaction \[Sn(s)+2F{{e}^{3+}}(aq)\xrightarrow{{}}2F{{e}^{2+}}(aq)\]                                                                 \[+S{{n}^{2+}}(aq)\]is
  A)
  \[1.68V\]            
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  B)
         \[1.40V\]            
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  C)
         \[0.91\text{ }V\]             
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  D)
         \[0.63\text{ }V\]
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• question_answer3) The standard emf of a cell, involving one electron change is found to be 0.591 V at\[25{}^\circ C\]. The equilibrium constant of the reaction is \[(F=96500\text{ }C\text{ }mo{{l}^{-1}})\]
  A)
  \[1.0\times {{10}^{1}}\]      
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  B)
                         \[1.0\times {{10}^{5}}\]
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  C)
         \[1.0\times {{10}^{10}}\]         
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  D)
         \[1.0\times {{10}^{30}}\]
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• question_answer4) The limiting molar conductivities\[{{\Lambda }^{o}}\]for\[NaCl,\] \[KBr\]and\[KCl\]are 126, 152 and\[150\,S\,c{{m}^{2}}mo{{l}^{-1}}\]respectively. The\[{{\Lambda }^{o}}\]for\[~NaBr\]is
  A)
  \[128\text{ }S\text{ }c{{m}^{2}}mo{{l}^{-1}}\]  
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  B)
         \[176\,S\text{ }c{{m}^{2}}mo{{l}^{-1}}\]
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  C)
  \[278\text{ }S\text{ }c{{m}^{2}}\text{m}o{{l}^{-1}}\]
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  D)
         \[302\text{ }S\text{ }c{{m}^{2}}mo{{l}^{-1}}\]
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• question_answer5) In a cell that utilises the reaction, \[Zn(s)+2{{H}^{+}}(aq)\xrightarrow{{}}Z{{n}^{2+}}(aq)+{{H}_{2}}(g)\] addition of\[{{H}_{2}}S{{O}_{4}}\]to cathode compartment, will
  A)
  lower the E and shift equilibrium to the left
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  B)
  lower the E and shift the equilibrium to the right
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  C)
  increase the E and shift the equilibrium to the right
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  D)
  increase the E and shift the equilibrium to the left
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• question_answer6) The\[E_{{{M}^{3+}}/{{M}^{2+}}}^{o}\]values for\[Cr,Mn,Fe\]and\[Co\]are\[-0.41+1.57.+0.77\]and\[+1.97\text{ }V\]respectively. For which one of these metals the change in oxidation state from +2 to +3 is easiest?
  A)
  \[Cr\]    
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  B)
                         \[Mn\]                 
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  C)
         \[Fe\]                   
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  D)
         \[Co\]
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