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 :

  Відповідь

  (A)

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

  Galvanization is applying a coating of :

  Відповідь

  (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 :

  Відповідь

  (B)

  752.4
• 4

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

  Відповідь

  (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:

  Відповідь

  (A)

  C₃H₈
• 6

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

  Відповідь

  (D)

  Distillation under reduced pressure
• 7

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

  Відповідь

  (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:

  Відповідь

  (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 :

  Відповідь

  (C)

  –110
• 10

  The product of the reaction given below is :
  
  

  Відповідь

  (D)

  
• 11

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

  Відповідь

  (C)

  $$(c)$$ only
• 12

  The absolute configuration of
  
  
  
  is :

  Відповідь

  (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:

  Відповідь

  (C)

  Four moles of NaOH and one mole of Br₂
• 14

  Thiol group is present in :

  Відповідь

  (C)

  Cysteine
• 15

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

  Відповідь

  (A)

  [Cr(H₂O)₆]²⁺ and [Fe(H₂O)₆]²⁺
• 16

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

  Відповідь

  (A)

  cis[Co(en)₂Cl₂]Cl
• 17

  Which of the following compounds is metallic and ferromagnetic ?

  Відповідь

  (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 :

  Відповідь

  (C)

  $$\sqrt {2meV} $$
• 19

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

  Відповідь

  (A)

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