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JEE MAIN - Chemistry (2015 (Offline))

  • 1
    The vapour pressure of acetone at 20oC is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20oC, its vapour pressure was 183 torr. The molar mass (g mol-1) of the substance is:
    Răspuns
    (A)
    64
  • 2
    Which of the following compounds will exhibit geometrical isomerism?
    Răspuns
    (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)
    Răspuns
    (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?
    Răspuns
    (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)
    Răspuns
    (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]
    Răspuns
    (A)
    reverse direction because Q > Kc
  • 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)
    Răspuns
    (A)
    63.5 g
  • 8
    The intermolecular interaction that is dependent on the inverse cube of distance between the molecule is:
    Răspuns
    (C)
    hydrogen bond
  • 9
    Which of the vitamins given below is water soluble?
    Răspuns
    (D)
    Vitamin C
  • 10
    In the following sequence of reactions:

    JEE Main 2015 (Offline) Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 220 English
    The product C is
    Răspuns
    (C)
    C6H5CHO
  • 11
    The synthesis of alkyl fluorides is best accomplished by:
    Răspuns
    (C)
    Swarts reaction
  • 12
    The number of geometric isomers that can exist for square planar [Pt (Cl) (py) (NH3) (NH2OH)]+ is (py = pyridine) :
    Răspuns
    (A)
    3
  • 13
    In the following sequence of reactions:

    JEE Main 2015 (Offline) Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 220 English
    The product C is
    Răspuns
    (C)
    C6H5CHO
  • 14
    The synthesis of alkyl fluorides is best accomplished by:
    Răspuns
    (C)
    Swarts reaction
  • 15
    The number of geometric isomers that can exist for square planar [Pt (Cl) (py) (NH3) (NH2OH)]+ is (py = pyridine) :
    Răspuns
    (A)
    3
  • 16
    The colour of KMnO4 is due to :
    Răspuns
    (B)
    L $$\to$$ M charge transfer transition
  • 17
    Which of the following compounds is not colored yellow?
    Răspuns
    (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.
    Răspuns
    (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?
    Răspuns
    (C)
    Xe
  • 20
    Higher order (>3) reactions are rare due to
    Răspuns
    (D)
    low probability of simultaneous collision of all the reacting species
  • 21
    The ionic radii (in Å) of N3–, O2– and F– are respectively:
    Răspuns
    (B)
    1.71, 1.40 and 1.36
  • 22
    Which of the following is the energy of a possible excited state of hydrogen?
    Răspuns
    (B)
    –3.4 eV