Solved papers for JEE Main & Advanced JEE Main Paper (Held On 10 April 2015)

done JEE Main Paper (Held On 10 April 2015) Total Questions - 30

• question_answer1) In the isolation of metals, calcination process usually results in: JEE Main Online Paper (Held On 10 April 2015)
  A)
   metal oxide
  done clear
  B)
   metal carbonate
  done clear
  C)
   metal hydroxide
  done clear
  D)
   metal sulphide
  done clear
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• question_answer2) Permanent hardness in water cannot be cured by : JEE Main Online Paper (Held On 10 April 2015)
  A)
   Ion exchange method
  done clear
  B)
   Treatment with washing soda
  done clear
  C)
   Boiling
  done clear
  D)
   Calgon's method
  done clear
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• question_answer3) Gaseous \[{{N}_{2}}{{O}_{4}}\] dissociates into gaseous \[N{{O}_{2}}\]according to the reaction \[{{N}_{2}}{{O}_{4}}(g)\rightleftharpoons 2N{{O}_{2}}(g)\] At 300 K and 1 atm pressure, the degree of dissociation of \[{{N}_{2}}{{O}_{4}}\] is 0.2. If one mole of \[{{N}_{2}}{{O}_{4}}\] gas is contained in a vessel, then the density of the equilibrium mixture is: JEE Main Online Paper (Held On 10 April 2015)
  A)
   3.11 g/L
  done clear
  B)
   6.22 g/L
  done clear
  C)
   4.56 g/L
  done clear
  D)
   1.56 g/L
  done clear
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• question_answer4) Complete hydrolysis of starch gives : JEE Main Online Paper (Held On 10 April 2015)
  A)
   galactose and fructose in equimolar amounts
  done clear
  B)
   glucose and fructose in equimolar  amounts
  done clear
  C)
   glucose only
  done clear
  D)
   glucose and galactose in equimolar amounts
  done clear
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• question_answer5) The correct statement on the isomerism associated with the following complex ions, \[{{[Ni{{({{H}_{2}}O)}_{5}}N{{H}_{3}}]}^{2+}},\] \[{{[Ni{{({{H}_{2}}O)}_{4}}{{(N{{H}_{3}})}_{2}}]}^{2+}}\]and \[{{[Ni{{({{H}_{2}}O)}_{3}}{{(N{{H}_{3}})}_{3}}]}^{2+}}\]is: JEE Main Online Paper (Held On 10 April 2015)
  A)
    and  show geometrical andoptical isomerism
  done clear
  B)
    and  show geometrical and optical isomerism
  done clear
  C)
   and  show only geometrical isomerism
  done clear
  D)
    and  show only geometrical isomerism
  done clear
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• question_answer6) The least number of oxy acids are formed by: JEE Main Online Paper (Held On 10 April 2015)
  A)
   Chlorine
  done clear
  B)
   Nitrogen
  done clear
  C)
    Fluorine
  done clear
  D)
   Sulphur
  done clear
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• question_answer7) 1.4 g of an organic compound was digested according to Kjeldahl's method and the ammonia evolved was absorbed in 60 mL of \[M/10\,{{H}_{2}}S{{O}_{4}}\] solution. The excess sulphuric acid required 20 mL of M/10 NaOH solution tor neutralization. The percentage of nitrogen in the compound is: JEE Main Online Paper (Held On 10 April 2015)
  A)
   24
  done clear
  B)
   5
  done clear
  C)
   10
  done clear
  D)
   3
  done clear
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• question_answer8) . JEE Main Online Paper (Held On 10 April 2015)
  A)
   Antihistamine
  done clear
  B)
   Antacid
  done clear
  C)
   Insecticide
  done clear
  D)
   Analgesic
  done clear
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• question_answer9) The geometry of \[XeO{{F}_{4}}\] by VSEPR theory is: JEE Main Online Paper (Held On 10 April 2015)
  A)
   octahedral
  done clear
  B)
   pentagonal planar
  done clear
  C)
   square pyramidal
  done clear
  D)
   trigonal bipyramidal
  done clear
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• question_answer10) Arrange the following amines in the order of increasing basicity. JEE Main Online Paper (Held On 10 April 2015)
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
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• question_answer11) If the principal quantum number n = 6, the correct sequence of filling of electrons will be: JEE Main Online Paper (Held On 10 April 2015)
  A)
  \[ns\to np\to (n-1)d\to (n-2)f\]
  done clear
  B)
  \[ns\to (n-1)d\to (n-2)f\to np\]
  done clear
  C)
  \[ns\to (n-2)f\to (n-1)d\to np\]
  done clear
  D)
  \[ns\to (n-2)f\to np\to (n-1)d\]
  done clear
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• question_answer12) The correct order of thermal stability of hydroxides is: JEE Main Online Paper (Held On 10 April 2015)
  A)
  \[Ba{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Mg{{(OH)}_{2}}\]
  done clear
  B)
  \[Ba{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Mg{{(OH)}_{2}}\]
  done clear
  C)
   \[Mg{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Ba{{(OH)}_{2}}\]
  done clear
  D)
  \[Mg{{(OH)}_{2}}<Ca{{(OH)}_{2}}<Sr{{(OH)}_{2}}<Ba{{(OH)}_{2}}\]
  done clear
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• question_answer13) A sample of a hydrate of barium chloride weighing 61 g was heated until all the water of hydration is removed. The dried sample weighed 52 g. The formula of the hydrated salt is : (atomic mass, Ba = 137 amu, Cl=35.5 amu) JEE Main Online Paper (Held On 10 April 2015)
  A)
  \[BaC{{l}_{2}}.3{{H}_{2}}O\]
  done clear
  B)
  \[BaC{{l}_{2}}.2{{H}_{2}}O\]
  done clear
  C)
  \[BaC{{l}_{2}}.{{H}_{2}}O\]
  done clear
  D)
  \[BaC{{l}_{2}}.4{{H}_{2}}O\]
  done clear
  View Answer play_arrow

• question_answer14)  A is: JEE Main Online Paper (Held On 10 April 2015)
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
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• question_answer15) Match the polymers in column-A with their main uses in column-B and choose the correct answer : JEE Main Online Paper (Held On 10 April 2015)

  	Column-A		Column-B
  A	Polystyrene	(i)	Paints and lacquers
  B	Glyptal	(ii)	Rain coats
  C	Polyvinyl Chloride	(iii)	Manufacture of toys
  D	Bakelite	(iv)	Computer discs

  A)
  A - (ii),  B- (i),  C- (iii), D- (iv)
  done clear
  B)
  A - (iii),  B- (iv),  C- (ii), D- (i)
  done clear
  C)
  A - (iii),  B- (i),  C- (ii), D- (iv)
  done clear
  D)
  A - (ii),  B- (iv),  C- (iii), D- (i)
  done clear
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• question_answer16) The optically inactive compound from the following is : JEE Main Online Paper (Held On 10 April 2015)
  A)
   2 - chlorobutane
  done clear
  B)
   2-chloropropanal
  done clear
  C)
   2- chloro-2-methylbutane
  done clear
  D)
                   2-chloropentanes
  done clear
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• question_answer17) In the long form of the periodic table, the valence shell electronic configuration of \[5{{s}^{2}}5{{p}^{4}}\]corresponds to the element present in: JEE Main Online Paper (Held On 10 April 2015)
  A)
   Group 17 and period 5
  done clear
  B)
   Group 16 and period 5
  done clear
  C)
   Group 17 and period 6
  done clear
  D)
   4 Group 16 and period 6
  done clear
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• question_answer18) The following statements relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them : JEE Main Online Paper (Held On 10 April 2015)
  A)
   On adsorption, the residual forces on the surface are increased
  done clear
  B)
  Enthalpy of adsorption is negative
  done clear
  C)
   On adsorption decrease in surface 3 energy appears as heat
  done clear
  D)
   Entropy of adsorption is negative
  done clear
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• question_answer19) A variable, opposite external potential \[({{E}_{ext}})\] is applied to the cell\[Zn|Z{{n}^{2+}}(1M)||C{{u}^{2+}}(1M)|Cu,\]potential 1.1 V. When \[{{E}_{ext}}<1.1V\] and \[{{E}_{ext}}>1.1V,\]respectively electrons flow from : JEE Main Online Paper (Held On 10 April 2015)
  A)
  anode to cathode and cathode to 1 anode
  done clear
  B)
   cathode to anode in both cases
  done clear
  C)
   cathode to anode and anode to cathode
  done clear
  D)
   anode to cathode in both cases
  done clear
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• question_answer20) An aqueous solution of a salt X turns blood red on treatment with \[SC{{N}^{-}}\] and blue on treatment with \[{{K}_{4}}[Fe{{(CN)}_{6}}].X\]also gives a positive chromyl chloride test. The salt X is: JEE Main Online Paper (Held On 10 April 2015)
  A)
  \[Cu{{(N{{O}_{3}})}_{2}}\]                          
  done clear
  B)
  \[FeC{{l}_{3}}\]
  done clear
  C)
   \[CuC{{l}_{2}}\]                               
  done clear
  D)
  \[Fe{{(N{{O}_{3}})}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer21) photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxy acetyl nitrile (PAN), and so forth- X is : JEE Main Online Paper (Held On 10 April 2015)
  A)
  \[C{{O}_{2}}\]                                   
  done clear
  B)
   CO
  done clear
  C)
  \[C{{H}_{4}}\]                                   
  done clear
  D)
  \[{{O}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer22) In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which \[\text{ }\!\!\alpha\!\!\text{ -}\]hydrogen has been replaced by halogen. This reaction is known as : JEE Main Online Paper (Held On 10 April 2015)
  A)
   Rosemond reaction
  done clear
  B)
   Etard reaction
  done clear
  C)
   Wolff - Kischner reaction
  done clear
  D)
   Hell - Volhard - Zelinsky reaction
  done clear
  View Answer play_arrow

• question_answer23) The cation that will not be precipitated by  \[{{H}_{2}}S\] in the presence of dil \[HCl\]is : JEE Main Online Paper (Held On 10 April 2015)
  A)
  \[C{{u}^{2+}}\]                                 
  done clear
  B)
  \[P{{b}^{2+}}\]
  done clear
  C)
  \[A{{s}^{3+}}\]                                 
  done clear
  D)
  \[C{{o}^{2+}}\]
  done clear
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• question_answer24) Which of the following is not an assumption of the kinetic theory of gases ? JEE Main Online Paper (Held On 10 April 2015)
  A)
   At high pressure, gas particles are difficult to compress.
  done clear
  B)
   A gas consists of many identical particles which are in continual motion.
  done clear
  C)
   Collisions of gas particles are perfectly elastic.
  done clear
  D)
   Gas particles have negligible volume.
  done clear
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• question_answer25) The reaction \[2{{N}_{2}}{{O}_{5}}(g)\to 4N{{O}_{2}}(g)+{{O}_{2}}(g)\]follows first order kinetics. The pressure of a vessel containing only \[{{N}_{2}}{{O}_{5}}\] was found to increase from 50 mm Hg to 87.5 mm Hg in 30 min. The pressure exerted by the gases after 60 min. will be (Assume temperature remains constant) : JEE Main Online Paper (Held On 10 April 2015)
  A)
   150 mm He
  done clear
  B)
   116.05 mm Hg
  done clear
  C)
    106.25 mm Hg
  done clear
  D)
   125 mm Hg
  done clear
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• question_answer26) A solution at \[20{}^\circ C\] is composed of 1.5 mol of benzene and 3.5 mol of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are 74.7 torr and 22.3 torr, respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively : JEE Main Online Paper (Held On 10 April 2015)
  A)
   30.5 torr and 0.389
  done clear
  B)
   38.0 torr and 0.589
  done clear
  C)
   35.8 torr and 0.280
  done clear
  D)
   4 35.0 torr and 0.480
  done clear
  View Answer play_arrow

• question_answer27) A compound A with molecular formula \[{{C}_{10}}{{H}_{13}}Cl\] gives a white precipitate on adding silver nitrate solution. A on reacting with alcoholic K.OH gives compound B as the main product. B on ozonolysis gives C and D. C gives Cannizaro reaction but not aldol condensation. U gives aldol condensation but not Cannizaro reaction. A is : JEE Main Online Paper (Held On 10 April 2015)
  A)
  
  done clear
  B)
  \[{{C}_{6}}{{H}_{5}}-C{{H}_{2}}-C{{H}_{2}}-\underset{\begin{smallmatrix}  | \\  Cl \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{3}}\]
  done clear
  C)
  
  done clear
  D)
  \[{{C}_{6}}{{H}_{5}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-Cl\]
  done clear
  View Answer play_arrow

• question_answer28) Which molecule/ion among the following cannot act as a ligand in complex compounds? JEE Main Online Paper (Held On 10 April 2015)
  A)
   CO
  done clear
  B)
  \[C{{N}^{-}}\]
  done clear
  C)
   \[C{{H}_{4}}\]
  done clear
  D)
  \[B{{r}^{-}}\]
  done clear
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• question_answer29) The heat of atomization of methane and ethane are 360 kJ/mol and 620 kJ/mol, respectively. The longest wavelength of light capable of breaking the C - C bond is (Avogadro number \[=6.02\times {{10}^{23}},h=6.62\times {{10}^{-34}}Js\]) JEE Main Online Paper (Held On 10 April 2015)
  A)
  \[1.49\times {{10}^{3}}nm\]                       
  done clear
  B)
  \[2.48\times {{10}^{4}}nm\]
  done clear
  C)
  \[2.48\times {{10}^{3}}nm\]                       
  done clear
  D)
  \[1.49\times {{10}^{4}}nm\]
  done clear
  View Answer play_arrow

• question_answer30) After understanding the assertion and reason, choose the correct option. Assertion : In the bonding molecular orbital (MO) of \[{{H}_{2}},\]electron density is increased between the nuclei. Reason : The bonding MO is\[{{\psi }_{A}}+{{\psi }_{B'}}\]which shows destructive interference of the combining electron waves. JEE Main Online Paper (Held On 10 April 2015)
  A)
   Assertion and reason are correct and Option reason is the correct explanation for the assertion.
  done clear
  B)
  Assertion is incorrect, reason is correct.
  done clear
  C)
   Assertion and reason are correct, but reason is not the correct explanation for the assertion.
  done clear
  D)
   Assertion is correct, reason is 4 incorrect.
  done clear
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