Solved papers for JEE Main & Advanced JEE Main Paper (Held on 7 May 2012)

done JEE Main Paper (Held on 7 May 2012) Total Questions - 30

• question_answer1) Which one of the following compounds is an anti-fertility drug?   JEE Main Online Paper (Held On 07 May 2012)
  A)
   Aspirin                
  done clear
  B)
                         Chloro my cetin
  done clear
  C)
                         Saheli
  done clear
  D)
                         Penicillin
  done clear
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• question_answer2) The most basic compound among the following is   JEE Main Online Paper (Held On 07 May 2012)
  A)
  Acetanilide        
  done clear
  B)
                         Benzyl amine
  done clear
  C)
                         p-Nitro aniline                  
  done clear
  D)
                         Aniline
  done clear
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• question_answer3) A battery is constructed of Cr and \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}.\]The unbalanced chemical equation when such a battery discharges is following: \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}+Cr+{{H}^{+}}\to C{{r}^{3+}}+{{H}_{2}}O+N{{a}^{+}}\] If one Faraday of electricity is passed through the battery during the charging, the number of moles of \[C{{r}^{3+}}\] removed from the solution is   JEE Main Online Paper (Held On 07 May 2012)
  A)
  \[\frac{4}{3}\]                                   
  done clear
  B)
                         \[\frac{1}{3}\]
  done clear
  C)
                         \[\frac{3}{3}\]                                   
  done clear
  D)
                         \[\frac{2}{3}\]
  done clear
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• question_answer4) The limiting line in Balmer series will have a frequency of (Rydberg constant, \[{{R}_{\infty }}=3.29\times {{10}^{15}}\]cycles/s)   JEE Main Online Paper (Held On 07 May 2012)
  A)
                  \[8.22\times {{10}^{14}}{{s}^{-1}}\]
  done clear
  B)
                         \[3.29\times {{10}^{15}}{{s}^{-1}}\]
  done clear
  C)
                         \[3.65\times {{10}^{14}}{{s}^{-1}}\]                        
  done clear
  D)
                         \[5.26\times {{10}^{13}}{{s}^{-1}}\]
  done clear
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• question_answer5) Which of the following cannot be represented by resonance structures?   JEE Main Online Paper (Held On 07 May 2012)
  A)
  Dimethyl ether   
  done clear
  B)
                         Nitrate anion
  done clear
  C)
                         Carboxylate anion          
  done clear
  D)
                         Toluene
  done clear
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• question_answer6) Which of the oxide groups among the following cannot be reduced by carbon?
  A)
  \[C{{u}_{2}}O,Sn{{O}_{2}}\]                       
  done clear
  B)
                         \[CaO,{{K}_{2}}O\]
  done clear
  C)
                         \[PbO,F{{e}_{2}}{{O}_{4}}\]                       
  done clear
  D)
                         \[F{{e}_{2}}{{O}_{3}},ZnO\]
  done clear
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• question_answer7) Among the following, the species having the smallest bond is   JEE Main Online Paper (Held On 07 May 2012)
  A)
  \[N{{O}^{-}}\]                                   
  done clear
  B)
                         \[N{{O}^{+}}\]
  done clear
  C)
                         \[{{O}_{2}}\]                                     
  done clear
  D)
                         NO
  done clear
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• question_answer8) Based on lattice energy and other considerations, which one of the following alkali metal chloride is expected to have the highest melting point?     JEE Main Online Paper (Held On 07 May 2012)
  A)
  NaCI
  done clear
  B)
                         KCl
  done clear
  C)
                         LiCI                        
  done clear
  D)
                         RbCl
  done clear
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• question_answer9) The entropy of a sample of a certain substance increases by \[0.836\,J\,{{K}^{-1}}\] on adding reversibly0.3344 J of heat at constant temperature. The temperature of the sample is:   JEE Main Online Paper (Held On 07 May 2012)
  A)
  2.5K                                      
  done clear
  B)
                         0.3K
  done clear
  C)
                         0.016K                                  
  done clear
  D)
                         0.4K
  done clear
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• question_answer10) The electron affinity of chlorine is 3.7 eV. 1 gram of chlorine is completely converted to \[C{{l}^{-1}}\] ion in a gaseous state. (1 eV = 23.06 kcal \[mo{{l}^{-1}}\]).Energy released in the process is   JEE Main Online Paper (Held On 07 May 2012)
  A)
  4.8kcal                 
  done clear
  B)
                         7.2kcal
  done clear
  C)
                         8.2 kcal                
  done clear
  D)
                         2.4 kcal
  done clear
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• question_answer11) Copper wire test for halogens is known as   JEE Main Online Paper (Held On 07 May 2012)
  A)
  Duma's Test     
  done clear
  B)
                         Beilstein' s Test
  done clear
  C)
                         Liebig'sTest        
  done clear
  D)
                         Lassigne's Test
  done clear
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• question_answer12) For 1 mol of an ideal gas at a constant temperature T, the plot of (log P) against (log V) is a(P: Pressure, V\ Volume)   JEE Main Online Paper (Held On 07 May 2012)
  A)
  Straight line parallel to x-axis.
  done clear
  B)
                         Straight line with a negative slope.
  done clear
  C)
                         Curve starting at origin.
  done clear
  D)
                         Straight line passing through origin.
  done clear
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• question_answer13) Which one of the following is a chain growth polymerisation?   JEE Main Online Paper (Held On 07 May 2012)
  A)
  Nucleic acid       
  done clear
  B)
                         Polystyrene
  done clear
  C)
                         Protein      
  done clear
  D)
                         Starch
  done clear
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• question_answer14) The d-electron configurations of \[C{{r}^{2+}},M{{n}^{2+}},F{{e}^{2+}}\]and \[C{{o}^{2+}}\]are \[{{d}^{4}},{{d}^{5}},{{d}^{6}}\]and \[{{d}^{7}}\] respectively. Which one of the following will exhibit the lowest paramagnetic behaviour? (Atomic no. Cr =24, Mn = 25, Fe = 26, Co = 27).     JEE Main Online Paper (Held On 07 May 2012)
  A)
  \[{{[Co{{({{H}_{2}}O)}_{6}}]}^{2+}}\]
  done clear
  B)
                         \[{{[Cr{{({{H}_{2}}O)}_{6}}]}^{2+}}\]
  done clear
  C)
                         \[{{[Mn{{({{H}_{2}}O)}_{6}}]}^{2+}}\]    
  done clear
  D)
                         \[{{[Fe{{({{H}_{2}}O)}_{6}}]}^{2+}}\]
  done clear
  View Answer play_arrow

• question_answer15) If x is the mass of the gas adsorbed on mass m of the adsorbent at pressure p, Freundlic had sorption isotherm gives a straight line on plotting   JEE Main Online Paper (Held On 07 May 2012)
  A)
  \[x/m\,vs\,p\]                  
  done clear
  B)
                         \[x/m\,vs1/\,p\]
  done clear
  C)
                         \[\log x/m\,vs\,\log \,p\]            
  done clear
  D)
                         \[\log x/m\,\,vs\,p\]
  done clear
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• question_answer16) The solubility (in mol\[{{L}^{-1}}\]) of AgCl\[({{K}_{sp}}=1.0\times {{10}^{-10}})\] in a 0.1 M KC1 solution will be   JEE Main Online Paper (Held On 07 May 2012)
  A)
  \[1.0\times {{10}^{-9}}\]              
  done clear
  B)
                         \[1.0\times {{10}^{-10}}\]
  done clear
  C)
                         \[1.0\times {{10}^{-5}}\]                              
  done clear
  D)
                         \[1.0\times {{10}^{-11}}\]
  done clear
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• question_answer17) Among the following which is the best description of water in the solid phase?   JEE Main Online Paper (Held On 07 May 2012)
  A)
  Covalent solid                   
  done clear
  B)
  Molecular solid
  done clear
  C)
  Ionic solid           
  done clear
  D)
  Network solid
  done clear
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• question_answer18) All of the following statements apply to proteins except   JEE Main Online Paper (Held On 07 May 2012)
  A)
  Proteins generally have no definite melting point
  done clear
  B)
  Proteins contain the grouping 'CONH'
  done clear
  C)
  Proteins have high molecular weight
  done clear
  D)
  Proteins can only contain the elements C, H, O and N.
  done clear
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• question_answer19) \[{{K}_{1}},{{K}_{2}}\]and\[{{K}_{3}}\] are the equilibrium constants of the following reactions (I), (II) and (III)respectively: (i)\[{{N}_{2}}+2{{O}_{2}}2N{{O}_{2}}\](ii)\[2N{{O}_{2}}{{N}_{2}}+2{{O}_{2}}\]                 (iii)\[N{{O}_{2}}\frac{1}{2}{{N}_{2}}+{{O}_{2}}\] The correct relation from the following is   JEE Main Online Paper (Held On 07 May 2012)
  A)
  \[{{K}_{1}}=\frac{1}{{{K}_{2}}}=\frac{1}{{{K}_{3}}}\]        
  done clear
  B)
                         \[{{K}_{1}}=\frac{1}{{{K}_{2}}}=\frac{1}{{{({{K}_{3}})}^{2}}}\]
  done clear
  C)
                         \[{{K}_{1}}=\sqrt{{{K}_{2}}}={{K}_{3}}\]
  done clear
  D)
                         \[{{K}_{1}}=\frac{1}{{{K}_{2}}}={{K}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer20) The concentrated sulphuric acid that is peddled commercial is \[95%{{H}_{2}}S{{O}_{4}}\] by weight. If the density of this commercial acid is 1.834 g\[c{{m}^{-3}},\] the molarity of this solution is   JEE Main Online Paper (Held On 07 May 2012)
  A)
  17.8 M          
  done clear
  B)
                         12.0 M
  done clear
  C)
                         10.5M                  
  done clear
  D)
                         15.7M
  done clear
  View Answer play_arrow

• question_answer21) A solid has a 'bcc' structure. If the distance of nearest approach between two atoms is 1.73A,the edge length of the cell is   JEE Main Online Paper (Held On 07 May 2012)
  A)
  314.20pm           
  done clear
  B)
                         1.41pm
  done clear
  C)
                         200pm 
  done clear
  D)
                         216pm
  done clear
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• question_answer22) Reaction rate between two substance A and B is expressed as following:\[\text{rate}\,\text{=k }\!\![\!\!\text{ A}{{\text{ }\!\!]\!\!\text{ }}^{\text{n}}}{{\text{ }\!\![\!\!\text{ B }\!\!]\!\!\text{ }}^{\text{m}}}\] If the concentration of A is doubled and concentration of B is made half of initialcon centration, the ratio of the new rate to the earlier rate will be:     JEE Main Online Paper (Held On 07 May 2012)
  A)
  \[m+n\]                              
  done clear
  B)
                         \[n-m\]
  done clear
  C)
                         \[\frac{1}{{{2}^{\left(m+n \right)}}}\]                    
  done clear
  D)
                         \[{{2}^{\left( n-m \right)}}\]
  done clear
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• question_answer23) How many cyclic structures are possible for\[{{C}_{4}}{{H}_{6}}?\]   JEE Main Online Paper (Held On 07 May 2012)
  A)
  3                                             
  done clear
  B)
                         5
  done clear
  C)
                         6                                             
  done clear
  D)
                         4
  done clear
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• question_answer24) Which is not the correct Statement? (At.nos.\[\text{Ce}=\text{58},\text{Lu}=\text{71},\text{La}=\text{57},\text{Yb}=\text{7}0\])     JEE Main Online Paper (Held On 07 May 2012)
  A)
  Colour of \[Y{{b}^{3+}}\] ion is pink.
  done clear
  B)
                         \[L{{a}^{3+}}\]is diamagnetic.
  done clear
  C)
                         \[C{{e}^{4+}}\] has\[{{f}^{0}}\] configuration.
  done clear
  D)
                         \[L{{u}^{3+}}\]had\[{{f}^{14}}\] configuration.
  done clear
  View Answer play_arrow

• question_answer25) In which of the following arrangements, the sequence is not strictly according to the property written against it?   JEE Main Online Paper (Held On 07 May 2012)
  A)
  \[C{{O}_{2}}<Si{{O}_{2}}<Sn{{O}_{2}}<Pb{{O}_{2}}\]: increasing oxidising power
  done clear
  B)
                         \[N{{H}_{3}}<P{{H}_{3}}<As{{H}_{3}}<Sb{{H}_{3}}\]: increasing basic strength
  done clear
  C)
                         \[HF < HCl < HBr < HI\]: increasing acid strength
  done clear
  D)
                         \[B<C<O<N\]: increasing first ionization enthalpy.
  done clear
  View Answer play_arrow

• question_answer26) The IUPAC name of the compoundis   JEE Main Online Paper (Held On 07 May 2012)
  A)
  1,2-Propoxide                  
  done clear
  B)
                         Propylene oxide
  done clear
  C)
                         1,2-Oxo propane             
  done clear
  D)
                         1,2-Epoxy propane
  done clear
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• question_answer27) Green house gases can be arranged in 'Global Warming Potential' sequence as   JEE Main Online Paper (Held On 07 May 2012)
  A)
  \[{{N}_{2}}O>CFC>C{{H}_{4}}>C{{O}_{2}}\]
  done clear
  B)
  \[CFC>{{N}_{2}}O>C{{H}_{4}}>C{{O}_{2}}\]
  done clear
  C)
  \[CFC>C{{O}_{2}}>{{N}_{2}}O>C{{H}_{4}}\]
  done clear
  D)
  \[C{{O}_{2}}>CFC>{{N}_{2}}O>C{{H}_{4}}\]
  done clear
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• question_answer28) Among the following the order of reactivity towards nucieophilic addition is   JEE Main Online Paper (Held On 07 May 2012)
  A)
  \[C{{H}_{3}}CHO>C{{H}_{3}}COC{{H}_{3}}>HCHO\]
  done clear
  B)
                         \[HCHO>C{{H}_{3}}CHO>C{{H}_{3}}COC{{H}_{3}}\]
  done clear
  C)
                         \[C{{H}_{3}}CHO>HCHO>C{{H}_{3}}COC{{H}_{3}}\]
  done clear
  D)
                         \[C{{H}_{3}}COC{{H}_{3}}>C{{H}_{3}}CHO>HCHO\]
  done clear
  View Answer play_arrow

• question_answer29) \[{{C}_{2}}{{H}_{5}}Br\xrightarrow[{}]{AgCN}X\xrightarrow[Zn-Hg/HCl]{\operatorname{Re}duction}Y,\]Here Y is   JEE Main Online Paper (Held On 07 May 2012)
  A)
  Ethyl methyl amine        
  done clear
  B)
                         n-propylamine
  done clear
  C)
                         Isopropylamine
  done clear
  D)
                         Ethylamine
  done clear
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• question_answer30) The ratio of number of oxygen atoms (0) in 16.0 gozone \[({{O}_{3}}),\] 28.0 g carbon monoxide (CO) and16.0 oxygen \[({{O}_{2}})\] is (Atomic mass: C = 12,0 = 16and Avogadro's constant\[{{N}_{A}}=6.0\times {{10}^{23}}mo{{l}^{-1}}\])   JEE Main Online Paper (Held On 07 May 2012)
  A)
  3:1:2                                     
  done clear
  B)
                         1:1:2
  done clear
  C)
                         3:1:1                                     
  done clear
  D)
                         1:1:1
  done clear
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