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Equilibrium · Question 76

AIPMT 2008MCQMedium📈 Topic in 12% papers+4−1
1

The values of Kp for the reactions, X Y + Z ....(i) A 2B ....(ii) are in the ratio 9 : 1. If degree of dissociation of X and A be equal, then total pressure at equilibrium (i) and (ii) are in the ratio

  1. 36 : 1
  2. 1 : 1
  3. 3 : 1
  4. 1 : 9

Answer

(1) 36 : 1

Solution

Let degree of dissociation = α for both; total pressures P1 and P2.

(i) Moles: X = 1 − α, Y = α, Z = α; total = 1 + α

Kp1 = 2 P1(1- )(1+ ) = 2 P11- 2

(ii) Moles: A = 1 − α, B = 2α; total = 1 + α

Kp2 = (2 )2 P2(1- )(1+ ) = 4 2 P21- 2

⇒ Kp1 Kp2 = P14P2 = 91

∴ P1 : P2 = 36 : 1

Answer: (1)

AIPMT 2008

Keep practising — Equilibrium

2

Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?

  1. MgCl2
  2. CaCl2
  3. SrCl2
  4. BaCl2
Out of syllabusAIPMT 2008
3

Which one of the following ionic species has the greatest proton affinity to form stable compound?

  1. NH2-
  2. F-
  3. I-
  4. HS-
AIPMT 2007
4

The equilibrium constants of the following are N2 + 3H2 2NH3; K1 N2 + O2 2NO; K2 H2 + 12O2 H2O; K3 The equilibrium constant (K) of the reaction: 2NH3 + 52O2 2NO + 3H2O will be

  1. K2K33/K1
  2. K2K3/K1
  3. K23K3/K1
  4. K1K33/K2
AIPMT 2007
5

A weak acid, HA, has a Ka of 1.00 10-5. If 0.100 mol of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to

  1. 1.00\%
  2. 99.9\%
  3. 0.100\%
  4. 99.0\%
AIPMT 2007
6

Calculate the pOH of a solution at 25 C that contains 1 10-10 M of hydronium ions, i.e. H3O+.

  1. 4.000
  2. 9.000
  3. 1.000
  4. 7.000
AIPMT 2007
7

For the reaction : CH4(g) + 2O2(g) CO2(g) + 2H2O(l), Hr = -890.3 kJ mol-1. Which of the following statements is not true?

  1. The reaction is exothermic.
  2. At equilibrium, the concentrations of CO2(g) and H2O(l) are not equal.
  3. The equilibrium constant for the reaction is given by Kp = [CO2][CH4][O2]
  4. Addition of CH4(g) or O2(g) at equilibrium will cause a shift to the right.
AIPMT 2006
8

Which of the following pairs constitutes a buffer?

  1. HCl and KCl
  2. HNO2 and NaNO2
  3. NaOH and NaCl
  4. HNO3 and NH4NO3
AIPMT 2006
9

The hydrogen ion concentration of a 10-8 M, HCl aqueous solution at 298 K (Kw = 10-14) is

  1. 1.0 10-8 M
  2. 1.0 10-6 M
  3. 1.0512 10-7 M
  4. 9.512 10-8 M
AIPMT 2006
10

At 25 , the dissociation constant of a base, BOH, is 1.0 10-12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be

  1. 1.0 10-5 mol L-1
  2. 1.0 10-6 mol L-1
  3. 2.0 10-6 mol L-1
  4. 1.0 10-7 mol L-1
AIPMT 2005
11

H2S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because

  1. presence of HCl decreases the sulphide ion concentration
  2. solubility product of group II sulphides is more than that of group IV sulphides
  3. presence of HCl increases the sulphide ion concentration
  4. sulphides of group IV cations are unstable in HCl.
AIPMT 2005

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