JEE MAIN - Chemistry (2016 (Offline))

• 1

  Decomposition of H₂O₂ follows a first order reaction. In fifty minutes the concentration of H₂O₂ decreases from 0.5 to 0.125 M in one such decomposition. When the concentration of H₂O₂ reaches 0.05 M, the rate of formation of O₂ will be :

  إجابة

  (A)

  6.93 $$\times$$ 10^-4 mol min^-1
• 2

  Galvanization is applying a coating of :

  إجابة

  (C)

  Zn
• 3

  18 g glucose (C₆H₁₂O₆) is added to 178.2 g water. The vapor pressure of water (in torr) for this aqueous solution is :

  إجابة

  (B)

  752.4
• 4

  The reaction of propene with HOCl (Cl₂ + H₂O) proceeds through the intermediate:

  إجابة

  (D)

  $$\mathrm{CH}_{3}-\mathrm{CH}^{+}-\mathrm{CH}_{2}-\mathrm{Cl}$$
• 5

  At 300 K and 1 atm, 15 mL of a gaseous hydrocarbon requires 375 mL air containing 20% O₂ by volume for complete combustion. After combustion the gases occupy 345 mL. Assuming that the water formed is in liquid form and the volumes were measured at the same temperature and pressure, the formula of the hydrocarbon is:

  إجابة

  (A)

  C₃H₈
• 6

  The distillation technique most suited for separating glycerol from spent-lye in the soap industry is :

  إجابة

  (D)

  Distillation under reduced pressure
• 7

  The reaction of zinc with dilute and concentrated nitric acid, respectively, produces :

  إجابة

  (D)

  N₂O and NO₂
• 8

  The equilibrium constant at 298 K for a reaction A + B $$\leftrightharpoons$$ C + D is 100. If the initial concentration of all the four species were 1M each, then equilibrium concentration of D (in mol L^–1) will be:

  إجابة

  (B)

  1.818
• 9

  The heats of combustion of carbon and carbon monoxide are –393.5 and –283.5 kJ mol^–1, respectively. The heat of formation (in kJ) of carbon monoxide per mole is :

  إجابة

  (C)

  –110
• 10

  The product of the reaction given below is :
  
  

  إجابة

  (D)

  
• 11

  $$2$$-chloro-$$2$$-methylpentane on reaction with sodium methoxide in methanol yields:
  
  

  إجابة

  (C)

  $$(c)$$ only
• 12

  The absolute configuration of
  
  
  
  is :

  إجابة

  (D)

  $$(2S, 3R)$$
• 13

  In the Hofmann bromamide degradation reaction, the number of moles of NaOH and Br₂ used per mole of amine produced are:

  إجابة

  (C)

  Four moles of NaOH and one mole of Br₂
• 14

  Thiol group is present in :

  إجابة

  (C)

  Cysteine
• 15

  The pair having the same magnetic moment is :
  [At. No.: Cr = 24, Mn = 25, Fe = 26, Co = 27]

  إجابة

  (A)

  [Cr(H₂O)₆]²⁺ and [Fe(H₂O)₆]²⁺
• 16

  Which one of the following complexes shows optical isomerism?
  (en = ethylenediamine)

  إجابة

  (A)

  cis[Co(en)₂Cl₂]Cl
• 17

  Which of the following compounds is metallic and ferromagnetic ?

  إجابة

  (A)

  CrO₂
• 18

  A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h / $$\lambda $$ (where $$\lambda $$ is wavelength associated with electron wave) is given by :

  إجابة

  (C)

  $$\sqrt {2meV} $$
• 19

  The species in which the $\mathrm{N}$ atom is in a state of $s p$ hybridization is :

  إجابة

  (A)

  $\mathrm{NO}_2^{+}$