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Equilibrium · Question 63

AIPMT 2010 (Mains)MCQMedium📈 Topic in 12% papers+4−1
1

The reaction, 2A(g) + B(g) 3C(g) + D(g) is begun with the concentrations of A and B both at an initial value of 1.00 M. When equilibrium is reached, the concentration of D is measured and found to be 0.25 M. The value for the equilibrium constant for this reaction is given by the expression

  1. [(0.75)3(0.25)] [(1.00)2(1.00)]
  2. [(0.75)3(0.25)] [(0.50)2(0.75)]
  3. [(0.75)3(0.25)] [(0.50)2(0.25)]
  4. [(0.75)3(0.25)] [(0.75)2(0.25)]

Answer

(2) [(0.75)3(0.25)] [(0.50)2(0.75)]

Solution

Let x M of B react: [D]eq = x = 0.25 M

[A]eq = 1.00 - 2x = 0.50 M

[B]eq = 1.00 - x = 0.75 M

[C]eq = 3x = 0.75 M

Kc = [C]3[D][A]2[B]

∴ Kc = (0.75)3(0.25)(0.50)2(0.75)

Answer: (2)

AIPMT 2010 (Mains)

Keep practising — Equilibrium

2

If pH of a saturated solution of Ba(OH)2 is 12, the value of its Ksp is

  1. 4.00 10-6 M3
  2. 4.00 10-7 M3
  3. 5.00 10-6 M3
  4. 5.00 10-7 M3
AIPMT 2010 (Prelims)
3

What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH? Ka for CH3COOH = 1.8 10-5

  1. 3.5 10-4
  2. 1.1 10-5
  3. 1.8 10-5
  4. 9.0 10-6
AIPMT 2010 (Prelims)
4

In which of the following equilibrium Kc and Kp are not equal?

  1. 2NO(g) N2(g) + O2(g)
  2. SO2(g) + NO2(g) SO3(g) + NO(g)
  3. H2(g) + I2(g) 2HI(g)
  4. 2C(s) + O2(g) 2CO(g)
AIPMT 2010 (Prelims)
5

In a buffer solution containing equal concentration of B- and HB, the Kb for B- is 10-10. The pH of buffer solution is

  1. 10
  2. 7
  3. 6
  4. 4
AIPMT 2010 (Prelims)
6

The dissociation constants for acetic acid and HCN at 25 are 1.5 10-5 and 4.5 10-10 respectively. The equilibrium constant for the equilibrium CN- + CH3COOH HCN + CH3COO- would be

  1. 3.3 10-5
  2. 3.3 10-4
  3. 3.3 104
  4. 3.3 105
AIPMT 2009
7

Which of the following molecules acts as a Lewis acid?

  1. (CH3)2O
  2. (CH3)3P
  3. (CH3)3N
  4. (CH3)3B
AIPMT 2009
8

The ionization constant of ammonium hydroxide is 1.77 10-5 at 298 K. Hydrolysis constant of ammonium chloride is

  1. 6.50 10-12
  2. 5.65 10-13
  3. 5.65 10-12
  4. 5.65 10-10
AIPMT 2009
9

What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)2?

  1. 0.40 M
  2. 0.0050 M
  3. 0.12 M
  4. 0.10 M
AIPMT 2009
10

The dissociation equilibrium of a gas AB2 can be represented as: 2AB2(g) 2AB(g) + B2(g) The degree of dissociation is x and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant Kp and total pressure P is

  1. (2Kp/P)1/2
  2. (Kp/P)
  3. (2Kp/P)
  4. (2Kp/P)1/3
AIPMT 2008
11

If the concentration of OH- ions in the reaction Fe(OH)3(s) Fe3+(aq) + 3OH-(aq) is decreased by 1/4 times, then equilibrium concentration of Fe3+ will increase by

  1. 64 times
  2. 4 times
  3. 8 times
  4. 16 times
AIPMT 2008

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