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Equilibrium · Question 40

AIPMT 2015MCQEasy📈 Topic in 25% papers+4−1
1

Which one of the following pairs of solution is not an acidic buffer ?

  1. CH3COOH and CH3COONa
  2. H2CO3 and Na2CO3
  3. H3PO4 and Na3PO4
  4. HClO4 and NaClO4

Answer

(4) HClO4 and NaClO4

Solution

An acidic buffer is a mixture of a weak acid and its salt with a strong base.

CH3COOH, H2CO3 and H3PO4 are weak acids, so (1), (2) and (3) are acidic buffers.

⇒ HClO4 is a strong acid (completely ionised), so HClO4 and NaClO4 cannot resist a change in pH.

∴ HClO4 and NaClO4 is not an acidic buffer.

Answer: (4)

AIPMT 2015

Keep practising — Equilibrium

2

The Ksp of Ag2CrO4, AgCl, AgBr and AgI are respectively, 1.1 10-12, 1.8 10-10, 5.0 10-13, 8.3 10-17. Which one of the following salts will precipitate last if AgNO3 solution is added to the solution containing equal moles of NaCl, NaBr, NaI and Na2CrO4?

  1. AgBr
  2. Ag2CrO4
  3. AgI
  4. AgCl
AIPMT 2015 (Cancelled)
3

If the value of equilibrium constant for a particular reaction is 1.6 1012, then at equilibrium the system will contain

  1. mostly products
  2. similar amounts of reactants and products
  3. all reactants
  4. mostly reactants.
AIPMT 2015 (Cancelled)
4

Which of the following salts will give highest pH in water?

  1. KCl
  2. NaCl
  3. Na2CO3
  4. CuSO4
AIPMT 2014
5

Using the Gibbs energy change, G = +63.3 kJ, for the following reaction, Ag2CO3(s) 2Ag+(aq) + CO32-(aq) the Ksp of Ag2CO3(s) in water at 25 C is ( R = 8.314 J K-1 mol-1)

  1. 3.2 10-26
  2. 8.0 10-12
  3. 2.9 10-3
  4. 7.9 10-2
AIPMT 2014
6

For the reversible reaction, N2(g) + 3H2(g) 2NH3(g) + heat The equilibrium shifts in forward direction

  1. by increasing the concentration of NH3(g)
  2. by decreasing the pressure
  3. by decreasing the concentrations of N2(g) and H2(g)
  4. by increasing pressure and decreasing temperature.
AIPMT 2014
7

For a given exothermic reaction, Kp and K'p are the equilibrium constants at temperatures T1 and T2, respectively. Assuming that heat of reaction is constant in temperature range between T1 and T2, it is readily observed that

  1. Kp > K'p
  2. Kp < K'p
  3. Kp = K'p
  4. Kp = 1K'p
AIPMT 2014
8

Which of these is least likely to act as a Lewis base ?

  1. BF3
  2. PF3
  3. CO
  4. F-
NEET 2013
9

Identify the correct order of solubility in aqueous medium.

  1. Na2S > CuS > ZnS
  2. Na2S > ZnS > CuS
  3. CuS > ZnS > Na2S
  4. ZnS > Na2S > CuS
NEET 2013
10

Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociated. The value of dissociation constant, Ka, for this acid will be

  1. 1.4 10-5
  2. 1.4 10-4
  3. 3.7 10-4
  4. 2.8 10-4
NEET 2013 (Karnataka)
11

At 100 the Kw of water is 55 times its value at 25 . What will be the pH of neutral solution? (log 55 = 1.74)

  1. 7.00
  2. 7.87
  3. 5.13
  4. 6.13
NEET 2013 (Karnataka)

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