Solved papers for JEE Main & Advanced JEE Main Paper (Held On 19 May 2012)

done JEE Main Paper (Held On 19 May 2012) Total Questions - 30

• question_answer1) Among the following, the molecule with the lowest dipole moment is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[CHC{{l}_{3}}\]               
  done clear
  B)
                         \[C{{H}_{3}}Cl\]
  done clear
  C)
                         \[C{{H}_{2}}C{{l}_{2}}\]                
  done clear
  D)
                         \[CC{{l}_{4}}\]
  done clear
  View Answer play_arrow

• question_answer2) If\[{{K}_{sp}}\]of\[Ca{{F}_{2}}\]at \[={{25}^{o}}C\]is\[1.7\times {{10}^{-10}},\]the combination amongst the following which gives a precipitate of \[Ca{{F}_{2}}\] is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[1\times {{10}^{-2}}M\,C{{a}^{2+}}\]and\[1\times {{10}^{-3}}M\,{{F}^{-}}\]
  done clear
  B)
  \[1\times {{10}^{-4}}M\,C{{a}^{2+}}\]and\[1\times {{10}^{-4}}M\,{{F}^{-}}\]
  done clear
  C)
  \[1\times {{10}^{-2}}M\,C{{a}^{2+}}\]and\[1\times {{10}^{-5}}M\,{{F}^{-}}\]
  done clear
  D)
  \[1\times {{10}^{-3}}M\,C{{a}^{2+}}\]and\[1\times {{10}^{-5}}M\,{{F}^{-}}\]
  done clear
  View Answer play_arrow

• question_answer3) The correct order of ligands in the spectro chemical series is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[C{{l}^{-}}>en>C{{N}^{-}}>NC{{S}^{-}}\]
  done clear
  B)
                         \[C{{l}^{-}}>en>NC{{S}^{-}}>C{{l}^{-}}\]
  done clear
  C)
                         \[NC{{S}^{-}}>C{{N}^{-}}>C{{l}^{-}}>en\]
  done clear
  D)
                         \[en>C{{N}^{-}}>C{{l}^{-}}>NC{{S}^{-}}\]
  done clear
  View Answer play_arrow

• question_answer4) The value of\[{{K}_{p}}\]for the equilibrium reaction\[{{N}_{2}}{{O}_{4}}(g)2N{{O}_{2}}(g)\]is 2. The percentage dissociation of \[{{N}_{2}}{{O}_{4}}(g)\]at a pressure of 0.5 atm is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  25                          
  done clear
  B)
                         88
  done clear
  C)
                         50                          
  done clear
  D)
                         71
  done clear
  View Answer play_arrow

• question_answer5) The order of basicity of the compounds is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[IV>I>III>II\]   
  done clear
  B)
                         \[I>III>II>IV\]
  done clear
  C)
                         \[III>I>IV>II\]   
  done clear
  D)
                         \[II>I>III>IV\]
  done clear
  View Answer play_arrow

• question_answer6) Ammonium chloride crystallizes in a body centred cubic lattice with edge length of unit cell of 390 pm. If the size of chloride ion is 180 pm, the size of ammonium ion would be     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  174pm                 
  done clear
  B)
                         158pm
  done clear
  C)
                         142pm                 
  done clear
  D)
                         126pm
  done clear
  View Answer play_arrow

• question_answer7) Which pair of elements with the given atomic numbers is expected to have similar properties?     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  40,72                                    
  done clear
  B)
                         20,36
  done clear
  C)
                         10,28                                    
  done clear
  D)
                         11,12
  done clear
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• question_answer8) Extraction of zinc from zinc blende is achieved By     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  roasting followed by self-reduction
  done clear
  B)
                         electrolytic reduction
  done clear
  C)
                         roasting followed by reduction with carbon
  done clear
  D)
                         roasting followed by reduction with another metal
  done clear
  View Answer play_arrow

• question_answer9) Liquids A and B form an ideal solution. At \[30{}^\circ C\], the total vapour pressure of a Solution containing 1 mol of A and 2 mol of B is 250 mm Hg. The total vapour pressure becomes 300 mm Hg when 1 more mol of A is added to the first solution. The vapour pressures of pure A and B at the same temperature are     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  150,450 mm Hg                
  done clear
  B)
  125,150 mm Hg
  done clear
  C)
  450,150 mm Hg                
  done clear
  D)
  250,300 mm Hg
  done clear
  View Answer play_arrow

• question_answer10) The IUPAC name of the following compound is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  (E)-2-hepten-4-yne
  done clear
  B)
                         Z)-5-hepten-3-yne
  done clear
  C)
                         (E)-5-hepten-3-yne
  done clear
  D)
                         (Z)-2-hepten-4-yne
  done clear
  View Answer play_arrow

• question_answer11) Which of the following paramagnetic ions would exhibit a magnetic moment (spin only) of the order of 5 BM? (At. Nos. \[Mn=25,Cr=24,V=23,Ti=22\])     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[M{{n}^{2+}}\]                               
  done clear
  B)
                         \[T{{i}^{2+}}\]
  done clear
  C)
                         \[{{V}^{2+}}\]                                   
  done clear
  D)
                         \[C{{r}^{2+}}\]
  done clear
  View Answer play_arrow

• question_answer12) Which one of the following will react most vigorously with water?     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  Li                                            
  done clear
  B)
                         K
  done clear
  C)
                         Rb         
  done clear
  D)
                         Na
  done clear
  View Answer play_arrow

• question_answer13) Which of the following has the square planar structure?     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[Xe{{F}_{4}}\]                 
  done clear
  B)
                         \[NH_{4}^{+}\]
  done clear
  C)
                         \[BF_{4}^{-}\]                                   
  done clear
  D)
                         \[CC{{l}_{4}}\]
  done clear
  View Answer play_arrow

• question_answer14) The major product obtained in the photobromination of 2-methyl butane is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  2-bromo-2-methylbutane
  done clear
  B)
                         1-bromo-2-methylbutane
  done clear
  C)
                         1-bromo-3-methylbutane
  done clear
  D)
                         2-bromo-3-methylbutane
  done clear
  View Answer play_arrow

• question_answer15) If the kinetic energy of an electron is increased four times, the wavelength of the de-Broglie wave associated with it would become     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  one fourth        
  done clear
  B)
                         half
  done clear
  C)
                         four times          
  done clear
  D)
                         two times
  done clear
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• question_answer16) When \[C{{O}_{2(g)}}\]is passed over red hot coke it partially gets reduced to \[CO(g).\]Upon passing L of \[C{{O}_{2}}(g)\] over red hot coke, the total volume of the gases increased to 700 mL. The composition of the gaseous mixture at STP is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[C{{O}_{2}}=300mL;CO=400mL\]
  done clear
  B)
                         \[C{{O}_{2}}=0.0mL;CO=700mL\]
  done clear
  C)
                         \[C{{O}_{2}}=200mL;CO=500mL\]
  done clear
  D)
                         \[C{{O}_{2}}=350mL;CO=350mL\]
  done clear
  View Answer play_arrow

• question_answer17) For a reaction \[A\to \]Products, a plot of \[\log {{t}_{1/2}}\] versus \[\log {{a}_{0}}\]is shown in the figure. If the initial concentration of A is represented by \[{{a}_{0}}\] the order of the reaction is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  one                                       
  done clear
  B)
                         zero
  done clear
  C)
                         two                                       
  done clear
  D)
                         three
  done clear
  View Answer play_arrow

• question_answer18) An open vessel at 300 K is heated till 2/5th of the air in it is expelled. Assuming that the volume of the vessel remains constant, the temperature to which the vessel is heated, is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  1500 K                  
  done clear
  B)
                         400 K
  done clear
  C)
                         500 K                                    
  done clear
  D)
                         750 K
  done clear
  View Answer play_arrow

• question_answer19) Which of the following is a polyamide?     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  Teflon                  
  done clear
  B)
                         Orion
  done clear
  C)
                         Nylon                                   
  done clear
  D)
                         Terylene
  done clear
  View Answer play_arrow

• question_answer20) The compound of xenon with zero dipole moment is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[Xe{{O}_{3}}\]                
  done clear
  B)
                         \[Xe{{F}_{4}}\]
  done clear
  C)
                         \[XeO{{F}_{4}}\]                              
  done clear
  D)
                         \[Xe{{O}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer21) The standard potentials of\[A{{g}^{+}}/Ag,H{{g}_{2}}^{2+}/2Hg,\]\[C{{u}^{2+}}/Cu\] and \[M{{g}^{2+}}/Mg\] electrodes are 0.80,0.79, 0.34 and -2.37 V, respectively. An aqueous solution which contains one mole per litre of the salts of each of the four metals is electrolyzed. With increasing voltage, the correct sequence of deposition of the metals at the cathode is   JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[Ag,Hg,Cu,Mg\]             
  done clear
  B)
                         \[Cu,Hg,Ag\]only
  done clear
  C)
                         \[Ag,Hg,Cu\]only            
  done clear
  D)
                         \[Mg,Cu,Hg,Ag\]
  done clear
  View Answer play_arrow

• question_answer22) The product of the reaction between ethyl benzene and N-bromosuccinamide is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
                                 
  done clear
  B)
                        
  done clear
  C)
                                                                           
  done clear
  D)
                        
  done clear
  View Answer play_arrow

• question_answer23) On addition of 1 mL of 10% NaCl solution to 10 mL gold sol in the presence of 0.025 g of starch, the coagulation is just prevented. Starch has gold number     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  2.5                         
  done clear
  B)
                         25
  done clear
  C)
                         0.25                                       
  done clear
  D)
                         0.025
  done clear
  View Answer play_arrow

• question_answer24) Which of the following is a non-reducing sugar?     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  Lactose                
  done clear
  B)
  Fructose
  done clear
  C)
  Sucrose
  done clear
  D)
  Maltose
  done clear
  View Answer play_arrow

• question_answer25) Fog is a colloidal solution of         JEE Main  Online Paper (Held On 19  May  2012)
  A)
  solid particles dispersed in gas
  done clear
  B)
                         solid particles dispersed in a liquid
  done clear
  C)
                         liquid particles dispersed in gas
  done clear
  D)
                         gaseous particles dispersed in a liquid
  done clear
  View Answer play_arrow

• question_answer26) The enthalpy of neutralisation of \[N{{H}_{4}}OH\]with HCl is -51.46 kJ \[\text{mo}{{\text{l}}^{-1}}\] and the enthalpy of neutralisation of NaOH with HCl is -55.90 kJ \[\text{mo}{{\text{l}}^{-1}}\]. The enthalpy of ionisation of\[N{{H}_{4}}OH\] His                   JEE Main  Online Paper (Held On 19  May  2012)
  A)
                  \[\text{-107}\text{.36}\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}}\]                  
  done clear
  B)
                  \[\text{-4}\text{.44}\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}}\]                
  done clear
  C)
                  \[\text{+107}\text{.36}\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}}\]                
  done clear
  D)
                  \[\text{+4}\text{.44}\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}}\]                
  done clear
  View Answer play_arrow

• question_answer27) Aspirin can be prepared by the reaction of     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  Salicyldehyde with acetic anhydride in presence of\[{{H}_{2}}S{{O}_{4}}\]
  done clear
  B)
                         Salicylic acid with metnanol in presence of\[{{H}_{2}}S{{O}_{4}}\]
  done clear
  C)
                         Salicylic acid with acetic anhydride in presence of \[{{H}_{2}}S{{O}_{4}}\]
  done clear
  D)
                         Cinnamic acid with acetic anhydride in presence of\[{{H}_{2}}S{{O}_{4}}\]
  done clear
  View Answer play_arrow

• question_answer28) Beilstein test is used for the estimation of which one of the following elements?     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  S                                             
  done clear
  B)
                         Cl
  done clear
  C)
                         C and H                
  done clear
  D)
                         N
  done clear
  View Answer play_arrow

• question_answer29) Square-planar geometry is shown by     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[[PtC{{l}_{2}}{{(N{{H}_{3}})}_{2}}]\]      
  done clear
  B)
                         \[{{[NiC{{l}_{4}}]}^{2-}}\]
  done clear
  C)
                         \[MnO_{4}^{-}\]                             
  done clear
  D)
                         \[CrO_{4}^{2-}\]
  done clear
  View Answer play_arrow

• question_answer30) Reagent used to convert allyl alcohol to acrole in is     JEE Main  Online Paper (Held On 19  May  2012)
  A)
  \[Mn{{O}_{2}}\]
  done clear
  B)
                         \[{{H}_{2}}{{O}_{2}}\]
  done clear
  C)
                         \[Os{{O}_{4}}\]                
  done clear
  D)
                         \[KMn{{O}_{4}}\]
  done clear
  View Answer play_arrow