Solved papers for JEE Main & Advanced JEE Main Paper (Held On 12 April 2014)

done JEE Main Paper (Held On 12 April 2014) Total Questions - 30

• question_answer1) If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom, the total energy of the revolving electron will be:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[\frac{1}{2}\frac{{{e}^{2}}}{r}\]                               
  done clear
  B)
  \[-\frac{{{e}^{2}}}{r}\]
  done clear
  C)
  \[m{{e}^{2}}\]                                  
  done clear
  D)
  \[1\,{{e}^{2}}\]
  done clear
  View Answer play_arrow

• question_answer2) The de-Broglie wavelength of a particle of mass 6.63 g moving with a velocity of 100 \[m{{s}^{-1}}\] is:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[{{10}^{-33}}m\]            
  done clear
  B)
  \[{{10}^{-35}}m\]
  done clear
  C)
  \[{{10}^{-31}}m\]                            
  done clear
  D)
  \[{{10}^{-25}}m\]
  done clear
  View Answer play_arrow

• question_answer3) What happens when an inert gas is added to an equilibrium keeping volume unchanged?   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  More product will form
  done clear
  B)
  Less product will form
  done clear
  C)
  More reactant will form
  done clear
  D)
  Equilibrium will remain unchanged
  done clear
  View Answer play_arrow

• question_answer4) The amount of \[BaS{{O}_{4}}\]formed upon mixing 100 mL of 20.8% \[{{H}_{2}}S{{O}_{4}}\] solution with 50 mL of 9.8% \[{{H}_{2}}S{{O}_{4}}\]solution with 50 mL of 9.8% \[{{H}_{2}}S{{O}_{4}}\] solution will be: (Ba = 137, Cl = 35.5, S = 32, H = 1 and O = 16)   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  23.3 g                   
  done clear
  B)
  11.65 g
  done clear
  C)
  30.6 g                   
  done clear
  D)
  33.2 g
  done clear
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• question_answer5) The rate coefficient (k) for a particular reactions is \[1.3\times {{10}^{-4}}{{M}^{-1}}\]\[{{s}^{-1}}\] at \[100{}^\circ C\], and \[1.3\times {{10}^{-3}}\] at \[150{}^\circ C\]. What is the energy of activation (EA) (in kJ) for this reaction? (R = molar gas constant\[=8.31J{{K}^{-1}}kJ\])   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  16                                          
  done clear
  B)
  60
  done clear
  C)
  99                                          
  done clear
  D)
  132
  done clear
  View Answer play_arrow

• question_answer6) How many electrons would be required to deposit 6.35 g of copper at the cathode during the electrolysis of an aqueous solution of copper sulphate? (Atomic mass of copper \[=63.5u,{{N}_{A}}=\] Avogadro's constant):   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[\frac{{{N}_{A}}}{20}\]                                
  done clear
  B)
  \[\frac{{{N}_{A}}}{10}\]
  done clear
  C)
  \[\frac{{{N}_{A}}}{5}\]                                  
  done clear
  D)
  \[\frac{{{N}_{A}}}{2}\]
  done clear
  View Answer play_arrow

• question_answer7) The \[\left( S{}^\circ  \right)\] of the following substances are: \[C{{H}_{4}}(g)186.2J{{K}^{-1}}mo{{l}^{-1}}\] \[{{O}_{2}}(g)205.2J{{K}^{-1}}mo{{l}^{-1}}\] \[{{H}_{2}}O(g)69.9J{{K}^{-1}}mo{{l}^{-1}}\] The entropy change \[(\Delta {{S}^{o}})\]for the reaction : \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\to C{{O}_{2}}(g)+2{{H}_{2}}O(l)\]is:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[-312.5J{{K}^{-1}}mo{{l}^{-1}}\]
  done clear
  B)
  \[-242.8J{{K}^{-1}}mo{{l}^{-1}}\]
  done clear
  C)
  \[-108.1J{{K}^{-1}}mo{{l}^{-1}}\]
  done clear
  D)
  \[-37.6J{{K}^{-1}}mo{{l}^{-1}}\]
  done clear
  View Answer play_arrow

• question_answer8) The conjugate base of hydrazoic acid is:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[{{N}^{-3}}\]                                    
  done clear
  B)
  \[N_{3}^{-}\]
  done clear
  C)
  \[N_{2}^{-}\]                                    
  done clear
  D)
  \[HN_{3}^{-}\]
  done clear
  View Answer play_arrow

• question_answer9) In a monoclinic unit cell, the relation of sides and angles are respectively:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[a=b\ne c\]and \[\alpha =\beta =\gamma ={{90}^{o}}\]
  done clear
  B)
  \[a\ne b\ne c\]and \[\alpha =\beta =\gamma ={{90}^{o}}\]
  done clear
  C)
  \[a\ne b\ne c\]and \[\beta =\gamma ={{90}^{o}}\ne \alpha \]
  done clear
  D)
  \[a\ne b\ne c\]and \[\alpha \ne \beta \ne \gamma \ne {{90}^{o}}\]
  done clear
  View Answer play_arrow

• question_answer10) The standard enthalpy of formation \[({{\Delta }_{f}}{{H}^{o}}_{298})\]for methane, \[C{{H}_{4}}\]is\[-74.9kJ\,mo{{l}^{-1}}.\]In order to calculate the average energy given out in the formation of a C ? H bond from this it is necessary to know which one of the following?   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  The dissociation energy of the hydrogen molecule, \[{{H}_{2}}\].
  done clear
  B)
  The first four ionisation energies of carbon.
  done clear
  C)
  The dissociation energy of \[{{H}_{2}}\]and enthalpy and sublimation of carbon (graphite).
  done clear
  D)
  The first four ionisation energies of carbon and electron affinity of hydrogen.
  done clear
  View Answer play_arrow

• question_answer11) Which of the following xenon-oxo compounds may not be obtained by hydrolysis of xenon fluorides?   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[Xe{{O}_{2}}{{F}_{2}}\]                               
  done clear
  B)
  \[XeO{{F}_{4}}\]
  done clear
  C)
  \[Xe{{O}_{3}}\]                
  done clear
  D)
  \[Xe{{O}_{4}}\]
  done clear
  View Answer play_arrow

• question_answer12) Excited hydrogen atom emits light in the ultraviolet region at \[2.47\times {{10}^{15}}Hz.\]With this frequency, the energy of a single photon is: \[(h=6.63\times {{10}^{-34}}Js)\]   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[8.041\times {{10}^{-40}}J\]     
  done clear
  B)
  \[2.680\times {{10}^{-19}}J\]
  done clear
  C)
  \[1.640\times {{10}^{-18}}J\]     
  done clear
  D)
  \[6.111\times {{10}^{-17}}J\]
  done clear
  View Answer play_arrow

• question_answer13) Which one of the following exhibits the large number of oxidation states?   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  Ti (22)                   
  done clear
  B)
  V (23)
  done clear
  C)
  Cr (24)                  
  done clear
  D)
  Mn (25)
  done clear
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• question_answer14) Copper becomes green when exposed to moist air for a long period. This is due to: [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  the formation of a layer of cupric oxide on the surface of copper.
  done clear
  B)
  the formation of a layer of basic carbonate of copper on the surface of copper.
  done clear
  C)
  the formation of a layer of cupric hydroxide on the surface of copper.
  done clear
  D)
  the formation of basic copper sulphate layer on the surface of the metal.
  done clear
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• question_answer15) Among the following species the one which causes the highest \[CFSE,{{\Delta }_{0}}\]as a ligand is:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[C{{N}^{-}}\]                   
  done clear
  B)
  \[N{{H}_{3}}\]
  done clear
  C)
  \[{{F}^{-}}\]                                       
  done clear
  D)
  CO
  done clear
  View Answer play_arrow

• question_answer16) Similarity in chemical properties of the atoms of elements in a group of the Periodic table is most closely related to:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  atomic numbers              
  done clear
  B)
  atomic masses
  done clear
  C)
  number of principal energy levels
  done clear
  D)
  number of valence electrons
  done clear
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• question_answer17) Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species  \[{{O}^{2-}},{{S}^{2-}},{{N}^{3-}},{{p}^{3-?}}\]   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[{{O}^{2-}}<{{N}^{3-}}<{{S}^{2-}}<{{p}^{3-}}\]
  done clear
  B)
  \[{{O}^{2-}}<{{p}^{3-}}<{{N}^{3-}}<{{S}^{2-}}\]
  done clear
  C)
  \[{{N}^{3}}<{{O}^{2-}}<{{p}^{3-}}<{{S}^{2-}}\]
  done clear
  D)
  \[{{N}^{3-}}<{{S}^{2-}}<{{O}^{2-}}<{{p}^{3-}}\]
  done clear
  View Answer play_arrow

• question_answer18) Global warming is due to increase of:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  methane and nitrous oxide in atmosphere
  done clear
  B)
  methane and \[C{{O}_{2}}\] in atmosphere
  done clear
  C)
  methane and \[{{O}_{3}}\] in atmosphere
  done clear
  D)
  methane and CO in atmosphere
  done clear
  View Answer play_arrow

• question_answer19) Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases \[{{H}_{2}}{{O}_{2}}\]acts as a reducing agent in acid medium?   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[MnO_{4}^{-}\]             
  done clear
  B)
  \[C{{r}_{2}}O_{7}^{2-}\]
  done clear
  C)
  \[SO_{3}^{2-}\]                
  done clear
  D)
  KI
  done clear
  View Answer play_arrow

• question_answer20) Which one of the following complexes will most likely absorb visible light? (At nos. Sc = 21, Ti = 22, V = 23, Zn = 30)   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[{{[Sc{{({{H}_{2}}O)}_{6}}]}^{3+}}\]       
  done clear
  B)
  \[{{[Ti{{(N{{H}_{3}})}_{6}}]}^{4+}}\]
  done clear
  C)
  \[{{[V{{(N{{H}_{3}})}_{6}}]}^{3+}}\]
  done clear
  D)
  \[{{[Zn{{(N{{H}_{3}})}_{6}}]}^{2+}}\]
  done clear
  View Answer play_arrow

• question_answer21) on mercuration-demercuration produces the major product:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer22) In the Victor-Meyer's test, the colour given by \[1{}^\circ ,\text{ }2{}^\circ \text{ }and\text{ }3{}^\circ \] alcohols are respectively:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  Red, colourless, blue
  done clear
  B)
  Red, blue, colourless
  done clear
  C)
  Colourless, red, blue
  done clear
  D)
  Red, blue, violet
  done clear
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• question_answer23) Conversion of benzene diazonium chloride to chlorobenzene is an example of which of the following reactions?   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  Claisen                 
  done clear
  B)
  Friedel-craft
  done clear
  C)
  Sandmeyer        
  done clear
  D)
   Wurtz
  done clear
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• question_answer24) In the presence of peroxide, HCl and HI do not give anti- Markownikoff's addition of alkenes because:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  One of the steps is endothermic in HCl and HI
  done clear
  B)
  Both HCl and HI are strong acids
  done clear
  C)
  HCl is oxidizing and the HI is reducing
  done clear
  D)
  All the steps are exothermic is HCl and HI
  done clear
  View Answer play_arrow

• question_answer25) The major product obtained in the photo catalyzed bromination of 2--methylbutane is:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  1-bromo-2-methylbutane
  done clear
  B)
  1-bromo-3-methylbutane
  done clear
  C)
  2-bromo-3-methylbutane
  done clear
  D)
  2-bromo-2-methylbutane
  done clear
  View Answer play_arrow

• question_answer26) Which of the following molecules has two sigma (s) and two \[{{p}_{i}}(\pi )\]bonds?   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  \[{{C}_{2}}{{H}_{4}}\]                    
  done clear
  B)
  \[{{N}_{2}}{{F}_{2}}\]
  done clear
  C)
  \[{{C}_{2}}{{H}_{2}}C{{l}_{2}}\]                 
  done clear
  D)
  HCN
  done clear
  View Answer play_arrow

• question_answer27) Which one of the following acids does not exhibit optical isomerism?   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  Lactic acid                           
  done clear
  B)
  Tartaric acid
  done clear
  C)
  Maleic acid                         
  done clear
  D)
  \[\text{ }\!\!\alpha\!\!\text{ -}\]amino acids
  done clear
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• question_answer28) Aminoglycosides are usually used as:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  antibiotic                            
  done clear
  B)
  analgesic
  done clear
  C)
  hypnotic                             
  done clear
  D)
  antifertility
  done clear
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• question_answer29) Which of the following will not show mutarotation?   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  Maltose                              
  done clear
  B)
  Lactose
  done clear
  C)
  Glucose                               
  done clear
  D)
  Sucrose
  done clear
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• question_answer30) Phthalic acid reacts with resorcinol in the presence of concentrated \[{{H}_{2}}S{{O}_{4}}\]to give:   [JEE Main Online Paper ( Held On 12 Apirl  2014 )
  A)
  Phenolphthalein             
  done clear
  B)
  Alizarin
  done clear
  C)
  Coumarin                           
  done clear
  D)
  Fluorescein
  done clear
  View Answer play_arrow