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Equilibrium · Question 45

AIPMT 2014MCQEasy📈 Topic in 38% papers+4−1
1

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.

Answer

(4) by increasing pressure and decreasing temperature.

Solution

As per Le Chatelier's principle:

Forward reaction: 4 mol gas → 2 mol gas ⇒ increasing pressure favours the forward reaction.

Forward reaction is exothermic ⇒ decreasing temperature favours the forward reaction.

Adding NH3, decreasing pressure or removing N2 and H2 shift the equilibrium backward.

Answer: (4)

AIPMT 2014

Keep practising — Equilibrium

2

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
3

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

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

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
5

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)
6

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)
7

The values of Ksp of CaCO3 and CaC2O4 are 4.7 10-9 and 1.3 10-9 respectively at 25 . If the mixture of these two is washed with water, what is the concentration of Ca2+ ions in water ?

  1. 5.831 10-5 M
  2. 6.856 10-5 M
  3. 3.606 10-5 M
  4. 7.746 10-5 M
NEET 2013 (Karnataka)
8

The dissociation constant of weak acid is 1 10-4. In order to prepare a buffer solution with a pH = 5, the [Salt]/[Acid] ratio should be

  1. 4 : 5
  2. 10 : 1
  3. 5 : 4
  4. 1 : 10
NEET 2013 (Karnataka)
9

Given that the equilibrium constant for the reaction, 2SO2(g) + O2(g) 2SO3(g) has a value of 278 at a particular temperature. What is the value of the equilibrium constant for the following reaction at the same temperature ? SO3(g) SO2(g) + 12O2(g)

  1. 1.8 10-3
  2. 3.6 10-3
  3. 6.0 10-2
  4. 1.3 10-5
AIPMT 2012 (Mains)
10

Given the reaction between 2 gases represented by A2 and B2 to give the compound AB(g), A2(g) + B2(g) 2AB(g) At equilibrium, the concentration of A2 = 3.0 10-3 M, of B2 = 4.2 10-3 M, of AB = 2.8 10-3 M If the reaction takes place in a sealed vessel at 527 , then the value of Kc will be

  1. 2.0
  2. 1.9
  3. 0.62
  4. 4.5
AIPMT 2012 (Mains)
11

pH of a saturated solution of Ba(OH)2 is 12. The value of solubility product (Ksp) of Ba(OH)2 is

  1. 3.3 10-7
  2. 5.0 10-7
  3. 4.0 10-6
  4. 5.0 10-6
AIPMT 2012 (Prelims)

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