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Equilibrium · Question 77

AIPMT 2008MCQEasy📈 Topic in 0% papers+4−1
1

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

Answer

(4) BaCl2

Solution

These are salts of a strong acid (HCl) and group 2 hydroxides; the cation undergoes hydrolysis:

M2+ + 2H2O M(OH)2 + 2H+

Basic strength of the hydroxides increases down the group: Mg(OH)2 < Ca(OH)2 < Sr(OH)2 < Ba(OH)2

The weaker the base, the greater the hydrolysis of its cation and the lower the pH.

Mg2+ (small, high charge density) hydrolyses most; Ba2+ hydrolyses least.

BaCl2 solution has the highest pH (nearly neutral).

Answer: (4)

Out of syllabusAIPMT 2008

Keep practising — Equilibrium

2

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
3

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
4

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
5

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
6

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
7

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
8

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
9

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
10

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
11

Equilibrium constants K1 and K2 for the following equilibria: NO(g) + 12O2(g) K1 NO2(g) and 2NO2(g) K2 2NO(g) + O2(g) are related as

  1. K2 = 1/K12
  2. K2 = K12
  3. K2 = 1/K1
  4. K2 = K1/2
AIPMT 2005

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