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 :

  Хариулт

  (A)

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

  Galvanization is applying a coating of :

  Хариулт

  (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 :

  Хариулт

  (B)

  752.4
• 4

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

  Хариулт

  (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:

  Хариулт

  (A)

  C₃H₈
• 6

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

  Хариулт

  (D)

  Distillation under reduced pressure
• 7

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

  Хариулт

  (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:

  Хариулт

  (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 :

  Хариулт

  (C)

  –110
• 10

  The product of the reaction given below is :
  
  

  Хариулт

  (D)

  
• 11

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

  Хариулт

  (C)

  $$(c)$$ only
• 12

  The absolute configuration of
  
  
  
  is :

  Хариулт

  (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:

  Хариулт

  (C)

  Four moles of NaOH and one mole of Br₂
• 14

  Thiol group is present in :

  Хариулт

  (C)

  Cysteine
• 15

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

  Хариулт

  (A)

  [Cr(H₂O)₆]²⁺ and [Fe(H₂O)₆]²⁺
• 16

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

  Хариулт

  (A)

  cis[Co(en)₂Cl₂]Cl
• 17

  Which of the following compounds is metallic and ferromagnetic ?

  Хариулт

  (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 :

  Хариулт

  (C)

  $$\sqrt {2meV} $$
• 19

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

  Хариулт

  (A)

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