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11th Standard English Medium Chemistry Subject Physical and Chemical Equilibrium Book Back 5 Mark Questions with Solution Part - II

11th Standard

    Reg.No. :
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Chemistry

Time : 00:30:00 Hrs
Total Marks : 25

    Part I

    5 x 5 = 25
  1. Consider the following reaction
    Fe3+(aq) + SCN(aq) ⇌ [Fe(SCN)]2+(aq)
    A solution is made with initial Fe3+, SCN- concentration of 1 x 10-3 M and 8 x 10-4 M respectively. At equilibrium [Fe(SCN)]2+ concentration is 2 x 10-4 M. Calculate the value of equilibrium constant.

  2. The following water gas shift reaction is an important industrial process for the production of hydrogen gas.
    CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
    At a given temperature Kp = 2.7. If 0.13 mol of CO, 0.56 mol of water, 0.78 mol of CO2 and 0.28 mol of H2 are introduced into a 2 L flask, and find out in which direction must the reaction proceed to reach equilibrium

  3. The equilibrium constant for the following reaction is 0.15 at 298 K and 1 atm pressure.
    N2O4(g) ⇌ 2NO2(g);
    \(\Delta \mathrm{H}_{\mathrm{f}}^{\circ}=57.32 \mathrm{KJmol}^{-1}\)
    The reaction conditions are altered as follows.
    a) The reaction temperature is altered to 100o C keeping the pressure at 1 atm, Calculate the equilibrium constant.

  4. At particular temperature KC = 4 x 10–2 for the reaction
    H2S(g) ⇌ H2(g) + ½ S2(g)
    Calculate KC for each of the following reaction
    i) 2H2S (g) ⇌ 2H2 (g) + S2 (g)
    ii) 3H2S (g) ⇌ 3H2 (g) + 3/2 S2(g)

  5. The equilibrium for the dissociation of XY2 is given as,
    2XY2 (g) ⇌ 2XY (g) + Y2(g)
    if the degree of dissociation x is so small compared to one. Show that 2 KP = PX3 where P is the total pressure and KP is the dissociation equilibrium constant of XY2.

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