JEE MAIN - Chemistry (2015 (Offline))

• 1

  The vapour pressure of acetone at 20^oC is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20^oC, its vapour pressure was 183 torr. The molar mass (g mol^-1) of the substance is:

  回答

  (A)

  64
• 2

  Which of the following compounds will exhibit geometrical isomerism?

  回答

  (D)

  1-Phenyl-2-butene
• 3

  In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is: (at. Mass Ag = 108; Br = 80)

  回答

  (D)

  24
• 4

  The molecular formula of a commercial resin used for exchanging ions in water softening is C₈H₇SO₃Na (Mol. Wt. 206). What would be the maximum uptake of Ca²⁺ ions by the resin when expressed in mole per gram resin?

  回答

  (B)

  1/412
• 5

  The following reaction is performed at 298 K
  2NO(g) + O₂ (g) $$\leftrightharpoons$$ 2NO₂ (g)
  The standard free energy of formation of NO(g) is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of NO₂(g) at 298 K? (KP = 1.6 × 10¹²)

  回答

  (C)

  0.5[2×86,600 – R(298) ln(1.6×10¹²)]
• 6

  The standard Gibbs energy change at 300 K for the reaction 2A $$\leftrightharpoons$$ B + C is 2494.2 J. At a given time, the composition of the reaction mixture is [A] = 1/2, [B] = 2 and [C] = 1/2. The reaction proceeds in the: [R = 8.314 J/K/mol, e = 2.718]

  回答

  (A)

  reverse direction because Q > K_c
• 7

  Two Faraday of electricity is passed through a solution of CuSO₄. The mass of copper deposited at the cathode is: (at. mass of Cu = 63.5 amu)

  回答

  (A)

  63.5 g
• 8

  The intermolecular interaction that is dependent on the inverse cube of distance between the molecule is:

  回答

  (C)

  hydrogen bond
• 9

  Which of the vitamins given below is water soluble?

  回答

  (D)

  Vitamin C
• 10

  In the following sequence of reactions:
  
  
  The product C is

  回答

  (C)

  C₆H₅CHO
• 11

  The synthesis of alkyl fluorides is best accomplished by:

  回答

  (C)

  Swarts reaction
• 12

  The number of geometric isomers that can exist for square planar [Pt (Cl) (py) (NH₃) (NH₂OH)]+ is (py = pyridine) :

  回答

  (A)

  3
• 13

  In the following sequence of reactions:
  
  
  The product C is

  回答

  (C)

  C₆H₅CHO
• 14

  The synthesis of alkyl fluorides is best accomplished by:

  回答

  (C)

  Swarts reaction
• 15

  The number of geometric isomers that can exist for square planar [Pt (Cl) (py) (NH₃) (NH₂OH)]+ is (py = pyridine) :

  回答

  (A)

  3
• 16

  The colour of KMnO₄ is due to :

  回答

  (B)

  L $$\to$$ M charge transfer transition
• 17

  Which of the following compounds is not colored yellow?

  回答

  (D)

  Zn₂[Fe(CN)₆]
• 18

  Assertion : Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen.
  
  Reason : The reaction between nitrogen and oxygen requires high temperature.

  回答

  (A)

  Both assertion and reason are correct, and the reason is the correct explanation for the assertion
• 19

  Which one has the highest boiling point?

  回答

  (C)

  Xe
• 20

  Higher order (>3) reactions are rare due to

  回答

  (D)

  low probability of simultaneous collision of all the reacting species
• 21

  The ionic radii (in Å) of N^3–, O^2– and F^– are respectively:

  回答

  (B)

  1.71, 1.40 and 1.36
• 22

  Which of the following is the energy of a possible excited state of hydrogen?

  回答

  (B)

  –3.4 eV