Solved papers for JEE Main & Advanced JEE Main Paper (Held On 22 April 2013)

done JEE Main Paper (Held On 22 April 2013)

• question_answer1)
  Oxidation state of sulphur in anions \[\operatorname{S}\operatorname{O}_{3}^{2-},{{\operatorname{S}}_{2}}\operatorname{O}_{4}^{2-},\] and \[{{\operatorname{S}}_{2}}\operatorname{O}_{6}^{2-}\] increases  in the orders:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   \[{{\operatorname{S}}_{2}}\operatorname{O}_{6}^{2-}<{{\operatorname{S}}_{2}}\operatorname{O}_{4}^{2-}<\operatorname{S}\operatorname{O}_{3}^{2-}\]
  done clear
  B)
   \[\operatorname{S}\operatorname{O}_{3}^{2-}<{{\operatorname{S}}_{2}}\operatorname{O}_{4}^{2-}<{{\operatorname{S}}_{2}}\operatorname{O}_{6}^{2-}\]
  done clear
  C)
   \[{{\operatorname{S}}_{2}}\operatorname{O}_{4}^{2-}<\operatorname{S}\operatorname{O}_{3}^{2-}<{{\operatorname{S}}_{2}}\operatorname{O}_{6}^{2-}\]
  done clear
  D)
   \[{{S}_{2}}O_{4}^{2-}<{{S}_{2}}O_{6}^{2-}<SO_{3}^{2-}\]
  done clear
  View Answer play_arrow

• question_answer2)
  A major component of Borsch regent is obtained by reacting hydrazine hydrate with of the following?     JEE Main  Online Paper (Held On 22 April 2013)
  A)
           
  done clear
  B)
   
  done clear
  C)
   
  done clear
  D)
   
  done clear
  View Answer play_arrow

• question_answer3)
  Given                 Reaction                                Energy Change (in KJ)                 \[\operatorname{L}\operatorname{i}(\operatorname{s})\to \operatorname{Li}(g)\]                                           161                 \[\operatorname{L}\operatorname{i}(g)\to {{\operatorname{Li}}^{+}}(g)\]                             520                 \[\frac{1}{2}{{\operatorname{F}}_{2}}(g)\to \operatorname{F}(g)\]                          77\[{{\operatorname{F}}_{2}}(g)+{{e}^{-}}\to {{\operatorname{F}}^{-}}(g)\]               (Electron gain                                                                                 enthalpy)                 \[\operatorname{L}{{\operatorname{i}}^{+}}(g)+{{\operatorname{F}}^{-}}(g)\to Li\,\,\operatorname{F}(s)\]   -1047                 \[\operatorname{L}\operatorname{i}(\operatorname{s})+\frac{1}{2}{{\operatorname{F}}_{2}}(g)\to \operatorname{Li}\operatorname{F}(s)\]       -617                 Based on data provided, the value of electron gain enthalpy of fluorine would be:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
  \[-300\operatorname{k}\operatorname{J}{{\operatorname{mol}}^{-1}}\]              
  done clear
  B)
  \[-350\operatorname{k}\operatorname{J}{{\operatorname{mol}}^{-1}}\]
  done clear
  C)
  \[-328\operatorname{k}\operatorname{J}{{\operatorname{mol}}^{-1}}\]              
  done clear
  D)
  \[-228\operatorname{k}\operatorname{J}{{\operatorname{mol}}^{-1}}\]
  done clear
  View Answer play_arrow

• question_answer4)
  A molecule M associates in given solvent according to the equation \[\operatorname{M}\underset{{}}{\overset{{}}{\longleftrightarrow}}{{(\operatorname{M})}_{\operatorname{n}.}}\] For a certain concentration of  M, The van? t Hoff factor was found to 0.9 and the fraction of associated molecules was 0.2 The value of n is:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   3                                            
  done clear
  B)
   5
  done clear
  C)
   2                                            
  done clear
  D)
   4
  done clear
  View Answer play_arrow

• question_answer5)
  The solubility order for alkali metal fluoride in water is:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   LiF < RbF < KF < NaF
  done clear
  B)
   RbF < KF < NaF < LiF
  done clear
  C)
   LiF > NaF > KF > RbF
  done clear
  D)
   LiF < NaF < KF < RbF
  done clear
  View Answer play_arrow

• question_answer6)
  \[\text{Xe}{{\operatorname{O}}_{4}}\] molecule is tetrahedral having:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   Two \[p\pi -d\pi \] bonds
  done clear
  B)
   One \[p\pi -d\pi \] bond
  done clear
  C)
   Four \[p\pi -d\pi \] bonds
  done clear
  D)
   Three \[p\pi -d\pi \] bonds
  done clear
  View Answer play_arrow

• question_answer7)
  The reaction  \[\operatorname{X}\to \operatorname{Y}\] is an exothermic reaction. Activation energy of the reaction for X into \[\operatorname{Y}\] is 150 \[150\operatorname{K}\operatorname{J}{{\operatorname{mol}}^{-1}}\]. Enthalpy of reaction is \[135\operatorname{K}\operatorname{J}{{\operatorname{mol}}^{-1}}\]. The activation energy for the reverse reaction, \[\operatorname{Y}\to \operatorname{X}\] will be:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   \[280\operatorname{kJ}{{\operatorname{mol}}^{-1}}\]                            
  done clear
  B)
   \[285\operatorname{kJ}{{\operatorname{mol}}^{-1}}\]            
  done clear
  C)
   \[270\operatorname{kJ}{{\operatorname{mol}}^{-1}}\]                            
  done clear
  D)
   \[15\operatorname{kJ}{{\operatorname{mol}}^{-1}}\]
  done clear
  View Answer play_arrow

• question_answer8)
  For which of the following compounds Kjeldahl method can be used to determine the percentage of Nitrogen?     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   Nitrobenzene                     
  done clear
  B)
   Pyridine
  done clear
  C)
   Alanine                                
  done clear
  D)
   Diazomethane
  done clear
  View Answer play_arrow

• question_answer9)
  Which of the following statements about aspirin is not true     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   It is effective in reliving pain
  done clear
  B)
   It is a neurologically active drug
  done clear
  C)
   It has antiblood clotting action
  done clear
  D)
   It belongs to narcotic analgesics
  done clear
  View Answer play_arrow

• question_answer10)
  The density of 3M solution of sodium chloride is  1.252\[~\text{gm}{{\text{L}}^{-1}}\]. The molality of the solution will be: (molar mass,\[\text{NaCI }=\text{85}.\text{5 g mo}{{\text{l}}^{\text{-1}}}\])     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   2.60 m                  
  done clear
  B)
   2.18 m
  done clear
  C)
   2.79 m                  
  done clear
  D)
   3.00 m
  done clear
  View Answer play_arrow

• question_answer11)
  Which of the following structures represents thymine?     JEE Main  Online Paper (Held On 22 April 2013)
  A)
             
  done clear
  B)
   
  done clear
  C)
   
  done clear
  D)
   
  done clear
  View Answer play_arrow

• question_answer12)
  The polymer used for optical lenses is:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   polypropylene    
  done clear
  B)
   polyvinyl chloride 
  done clear
  C)
   polythene
  done clear
  D)
   polymethyl methacrylate
  done clear
  View Answer play_arrow

• question_answer13)
  Which of the following is diamagnetic?     JEE Main  Online Paper (Held On 22 April 2013)
  A)
  \[[\operatorname{F}e{{({{\operatorname{CN}}_{6}})}^{3-}}\]                    
  done clear
  B)
   \[{{[\operatorname{Co}(\operatorname{O}\operatorname{X})]}^{3-}}\]
  done clear
  C)
   \[{{[\operatorname{Fe}{{\operatorname{F}}_{6}}]}^{3-}}\]                        
  done clear
  D)
   \[{{[\operatorname{Co}{{\operatorname{F}}_{6}}]}^{3-}}\]
  done clear
  View Answer play_arrow

• question_answer14)
  Bond order normally gives idea of stability of a molecular species. All the molecules viz. \[{{\operatorname{H}}_{2}},\] \[\operatorname{L}{{\operatorname{i}}_{2}}\] and \[{{\operatorname{B}}_{2}}\] have the same bond order yet they are not equally stable. The Their stability order is:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   \[{{\text{H}}_{\text{2}}}>{{\text{B}}_{\text{2}}}>\text{L}{{\text{i}}_{\text{2}}}\]      
  done clear
  B)
   \[\text{L}{{\text{i}}_{\text{2}}}\text{}{{\text{H}}_{\text{2}}}>{{\text{B}}_{\text{2}}}\]
  done clear
  C)
   \[{{\operatorname{Li}}_{2}}>{{\text{B}}_{\text{2}}}>{{\operatorname{H}}_{2}}\]  
  done clear
  D)
   \[{{\text{B}}_{\text{2}}}>{{\operatorname{H}}_{2}}>{{\operatorname{Li}}_{2}}\]
  done clear
  E)
  (e) None of these
  done clear
  View Answer play_arrow

• question_answer15)
  Which one of the following arrangements represents the correct order of solubilities of sparingly soluble soluble salts\[\operatorname{H}{{\operatorname{g}}_{2}}{{\operatorname{CI}}_{2}},C{{r}_{2}}{{(S{{O}_{4}})}_{3}},\]\[BaS{{O}_{4}}\] and \[\text{CrC}{{\text{l}}_{3}}\] respectively?      JEE Main  Online Paper (Held On 22 April 2013)
  A)
   \[BaS{{O}_{4}}>H{{g}_{2}}C{{l}_{2}}>C{{r}_{2}}{{(S{{O}_{4}})}_{3}}>CrC{{l}_{3}}\]
  done clear
  B)
   \[BaS{{O}_{4}}>H{{g}_{2}}C{{l}_{2}}>CrC{{l}_{3}}>C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]
  done clear
  C)
   \[BaS{{O}_{4}}>CrC{{l}_{3}}>H{{g}_{2}}C{{l}_{2}}>C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]
  done clear
  D)
   \[H{{g}_{2}}C{{l}_{2}}>BaS{{O}_{4}}>CrC{{l}_{3}}>C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer16)
  The wave number of the first emission line in the Balmer series of H-Spectrum is: (R= Rydberg constant):     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   \[\frac{5}{36}\operatorname{R}\]                  
  done clear
  B)
   \[\frac{9}{400}\operatorname{R}\]
  done clear
  C)
   \[\frac{7}{6}\operatorname{R}\]                                     
  done clear
  D)
    \[\frac{3}{4}\operatorname{R}\]
  done clear
  View Answer play_arrow

• question_answer17)
  What is the structure of the major product when phenol is treated with bromine water?     JEE Main  Online Paper (Held On 22 April 2013)
  A)
           
  done clear
  B)
   
  done clear
  C)
   
  done clear
  D)
   
  done clear
  View Answer play_arrow

• question_answer18)
  \[NaOH\] is a strong base. What will be pH of \[5.0\times {{10}^{-2}}\,M\,\,NaOH\] solution? \[(\log \,2\,=\,0.3)\]     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   14.00                                    
  done clear
  B)
   13.70
  done clear
  C)
   13.00                    
  done clear
  D)
   12.70
  done clear
  View Answer play_arrow

• question_answer19)
  Flocculation value of \[BaC{{l}_{2}}\] is much less then that of \[KCl\] for sol A and flocculation value of \[\operatorname{N}{{\operatorname{a}}_{2}}\operatorname{S}{{\operatorname{O}}_{4}}\] is much less than that of \[\text{NaBr}\]for sol B. The correct statement  among the following is:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   Both the sols A and B are negatively charged              
  done clear
  B)
   Sol A is positively charged and Sol B is negatively charged
  done clear
  C)
   Both the sols A and B are positively charged
  done clear
  D)
   Sol A is negatively charged and sol B is positively charged
  done clear
  View Answer play_arrow

• question_answer20)
  Amongst the following alcohols which would react fastest with conc. HCI and \[ZnC{{l}_{2}}\]?     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   pentanol                              
  done clear
  B)
   2-methylbutanol
  done clear
  C)
   2-pentanol                          
  done clear
  D)
   2-methy lbutan-2ol
  done clear
  View Answer play_arrow

• question_answer21)
  Values of dissociation constant, \[{{\text{K}}_{\text{a}}}\]are given as follows:                 Acid                                        \[{{\text{K}}_{\text{a}}}\]                 \[\operatorname{HCN}\]                                    \[6.2\times {{10}^{-10}}\]                   \[HF\]                                     \[7.2\times {{10}^{-4}}\]                 \[HN{{O}_{2}}\]                                     \[4.0\times {{10}^{-4}}\]                 Correct order of increasing base strength of the base \[{{\operatorname{CN}}^{-}},{{\operatorname{F}}^{-}}\] and \[\operatorname{NO}_{2}^{-}\]will be:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   \[{{\operatorname{F}}^{-}}<{{\operatorname{CN}}^{-}}<\operatorname{NO}_{2}^{-}\]       
  done clear
  B)
   \[NO_{2}^{-}<C{{N}^{-}}<{{F}^{-}}\]
  done clear
  C)
   \[{{\operatorname{F}}^{-}}<\operatorname{NO}_{2}^{-}<{{\operatorname{CN}}^{-}}\]       
  done clear
  D)
   \[\operatorname{NO}_{2}^{-}<\operatorname{F}_{{}}^{-}<\operatorname{CN}_{{}}^{-}\]
  done clear
  View Answer play_arrow

• question_answer22)
  Clemmensen reduction of a ketone is carried out in the presence of :     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   \[LiAl{{H}_{4}}\]                  
  done clear
  B)
   \[Zn-Hg\] with \[HCl\]
  done clear
  C)
   Glycol with \[KOH\]
  done clear
  D)
   \[{{H}_{2}}\] with \[Pt\] as catalyst
  done clear
  View Answer play_arrow

• question_answer23)
  Which of the following statements is incorrect?     JEE Main  Online Paper (Held On 22 April 2013)
  A)
  \[\operatorname{F}{{\operatorname{e}}^{2}}^{+}\]ion also gives blood  red  colour  with \[{{\operatorname{SCN}}^{-}}\]ion    
  done clear
  B)
   \[F{{e}^{3+}}\]ion given blood red colour with \[SC{{N}^{-}}\] ion.
  done clear
  C)
   On Passing \[{{H}_{2}}S\] into \[N{{a}_{2}}Zn{{O}_{2}}\] solution, a white ppt of \[ZnS\] is formed
  done clear
  D)
   Cupric ion react with excess of ammonia solution to give deep blue colour of \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\] ion.
  done clear
  View Answer play_arrow

• question_answer24)
  The  Order of increasing sizes of atomic radii among the elements O, S, Se and As is:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   \[As-S<O<Se\]    
  done clear
  B)
   \[Se<S<As<O\]
  done clear
  C)
   \[O<S<As<Se\]   
  done clear
  D)
    \[O<S<Se<As\]
  done clear
  View Answer play_arrow

• question_answer25)
  In Williamason synthesis of mixed ether having a primary and a tertiary alkyl  group if tertiary halide is used, then:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   Rate of reaction will be slow due to slow cleavage of carbon ? halogen bond
  done clear
  B)
   Alkene will be the main product
  done clear
  C)
   Simple ether will form instead of mixed ether
  done clear
  D)
    Expected mixed ether will be formed
  done clear
  View Answer play_arrow

• question_answer26)
  Which of the following would not give 2-phenylbutane as the major product in a Friedel-Crafts alkylation reaction?     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   1-butene + HF
  done clear
  B)
   2-butanol+ \[{{\operatorname{H}}_{2}}{{\operatorname{SO}}_{4}}\]
  done clear
  C)
   Butanoykhloride \[+AlC{{l}_{3}}\] then \[Zn,\,HCl\]
  done clear
  D)
   Butyl chloride \[+AlC{{l}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer27)
  Arrange in the correct order of stability (decreasing order) for the following  molecules : ­­­   JEE Main  Online Paper (Held On 22 April 2013)
  A)
   (I) > (II) > (III) > (IV)
  done clear
  B)
   (IV) > (III) > (II)\[\approx \](I)
  done clear
  C)
   (I) > (II) \[\approx \] (III) > (IV)
  done clear
  D)
   (III) > (I) \[\approx \] (II) > (IV)
  done clear
  View Answer play_arrow

• question_answer28)
  Which one of the following statements about packing in solids in incorrect?     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   Coordination number in bee mode of packing is 8
  done clear
  B)
   Coordination number in hcp mode of packing is 12.
  done clear
  C)
   Void space in hcp mode of packing is 32%
  done clear
  D)
   Void space in ccp mode of packing in 26%
  done clear
  View Answer play_arrow

• question_answer29)
  The Wurtz-Fitting reaction involues  condensation of:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   two molecules of aryl halides
  done clear
  B)
   one molecule of each of aryl- halide and phenol        
  done clear
  C)
   one molecule of each aryl-halide and phenol
  done clear
  D)
   two molecules of aralkyl-halides
  done clear
  View Answer play_arrow

• question_answer30)
  In Goldschmidt alumino thermic process which of the following reducing agents is used:     JEE Main  Online Paper (Held On 22 April 2013)
  A)
   calcium                                
  done clear
  B)
   coke
  done clear
  C)
   AI- powder                          
  done clear
  D)
   sodium
  done clear
  View Answer play_arrow