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JEE MAIN - Chemistry (2009)

  • 1
    A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution ?
    回答
    (B)
    The solution is non-ideal, showing +ve deviation from Raoult’s law.
  • 2
    The number of stereoisomers possible for a compound of the molecular formula CH3 - CH = CH - CH(OH) - Me is :
    回答
    (B)
    4
  • 3
    The alkene that exhibits geometrical isomerism is :
    回答
    (C)
    2-butene
  • 4
    The IUPAC name of neopentane is
    回答
    (B)
    2, 2-dimethylpropane
  • 5
    Arrange the carbanions, $${(C{H_3})_3}\overline C $$, $$\overline C C{l_3}$$ , $${(C{H_3})_2}\overline C H$$, $${C_6}{H_5}\overline C H{}_2$$ in order of their decreasing stability :
    回答
    (B)
    $$\overline C C{l_3}$$ > $${C_6}{H_5}\overline C H{}_2$$ > $${(C{H_3})_2}\overline C H$$ > $${(C{H_3})_3}\overline C $$
  • 6
    Solid Ba(NO3)2 is gradually dissolved in a 1.0 $$\times$$ 10-4 M Na2CO3 solution. At what concentration of Ba2+ will a precipitate begin to form ?
    (Ksp for BaCO3 = 5.1 $$\times$$ 10−9 )
    回答
    (A)
    5.1 $$\times$$ 10-5 M
  • 7
    On the basis of the following thermochemical data :
    ($$\Delta _fG^oH^+_{(aq)}$$ = 0)

    H2O(l) $$\to$$ H+(aq) + OH-(aq); $$\Delta H$$ = 57.32 kJ
    H2(g) + $${1 \over 2} O_2(g) \to$$ H2O(l); $$\Delta H$$ = -286.20 kJ

    The value of enthalpy of formation of OH− ion at 25oC is :
    回答
    (B)
    -228.88 kJ
  • 8
    Two liquids X and Y form an ideal solution. At 300K, vapour pressure of the solution containing 1 mol of X and 3 mol of Y is 550 mm Hg. At the same temperature, if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by 10 mm Hg. Vapour pressure (in mm Hg) of X and Y in their pure states will be, respectively :
    回答
    (C)
    400 and 600
  • 9
    In Cannizzaro reaction given below
    2PhCHO $$\buildrel {\mathop {:OH}\limits^{\left( - \right)} } \over \longrightarrow $$ PhCH2OH + $$PhC\mathop O\limits^{..} $$2(-)
    the slowest step is :
    回答
    (A)
    the transfer of hydride to the carbonyl group
  • 10
    The set representing the correct order of ionic radius is :
    回答
    (A)
    $$N{a^ + } > L{i^ + } > M{g^{2 + }} > B{e^{2 + }}$$
  • 11
    The two functional groups present in a typical carbohydrate are
    回答
    (D)
    - OH and -CHO
  • 12
    Which of the following on heating with aqueous KOH, produces acetaldehyde ?
    回答
    (D)
    CH3CHCl2
  • 13
    A liquid was mixed with ethanol and a drop of concentrated H2SO4 was added. A compound with a fruity smell was formed. The liquid was :
    回答
    (D)
    CH3COOH
  • 14
    The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is :
    回答
    (C)
    salicylic acid
  • 15
    Which of the following pairs represents linkage isomers ?
    回答
    (A)
    [Pd (P Ph3)2 (NCS)2] and [Pd (P Ph3)2 (SCN)2]
  • 16
    Which of the following has an optical isomer ?
    回答
    (C)
    [Co(en)2(NH3)2]3+
  • 17
    In context with the transition elements, which of the following statements is incorrect ?
    回答
    (B)
    In the highest oxidation states, the transition metal show basic character and form cationic complexes.
  • 18
    The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2=0.301) :
    回答
    (C)
    46.06 minutes
  • 19
    In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is
    CH3OH(l) + 3/2O2 $$\to$$ CO2 (g) + 2H2O (l)
    At 298K standard Gibb’s energies of formation for CH3OH(l), H2O(l) and CO2 (g) are -166.2, -237.2 and -394.4 kJ mol−1 respectively. If standard enthalpy of combustion of methanol is -726 kJ mol−1, efficiency of the fuel cell will be
    回答
    (C)
    97%
  • 20
    Given : $$E_{F{e^{3 + }}/Fe}^o$$ = -0.036V; $$E_{F{e^{2 + }}/Fe}^o$$ = -0.439 V
    The value of standard electrode potential for the change,
    Fe3+ (aq) + e- $$\to$$ Fe2+ (aq) will be
    回答
    (C)
    0.770 V
  • 21
    Given : $$E_{F{e^{3 + }}/Fe}^o$$ = -0.036V; $$E_{F{e^{2 + }}/Fe}^o$$ = -0.439 V
    The value of standard electrode potential for the change,
    Fe3+ (aq) + e- $$\to$$ Fe2+ (aq) will be
    回答
    (C)
    0.770 V
  • 22
    Using MO theory, predict which of the following species has the shortest bond length?
    回答
    (D)
    $$O_2^{2+}$$
  • 23
    In which of the following arrangements, the sequence is not strictly according to the property written against it
    回答
    (C)
    NH3 < PH3 < AsH3 < SbH3 : increasing basic strength
  • 24
    In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainity with which the position of the electron can be located is (h = 6.6 $$\times$$ 10-34 kg m2s-1, mass of electron, em = 9.1 $$\times$$ 10-31 kg)
    回答
    (B)
    1.92 $$\times$$ 10-3 m
  • 25
    Calculate the wavelength (in nanometer) associated with a proton moving at 1.0 x 103 ms−1 (Mass of proton = 1.67 $$\times$$ 10-27 kg and h = 6.63 $$\times$$ 10-34 Js) :
    回答
    (A)
    0.40 nm