Chemical Equilibrium Exam Quiz!

25 Questions | By Jhapriyank1999 | Last updated: Mar 21, 2022 | Total Attempts: 810

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1.

If the concentration of B is increased at fixed temperature, in the reaction, A + 2B ⇋ C + 3D the equilibrium constant of reaction will be
- A.
  
  Increases
- B.
  
  Decreases
- C.
  
  Remains Unchanged
- D.
  
  First increases then decreases
2.

The value of K_c for the reaction N₂(g) + 3H₂ (g) ⇌ 2 NH₃ (g) is 0.65 at 300°C. Find the value of K_p at 300°C.
- A.
  
  0.29 × 10^-4
- B.
  
  2.9 × 10^-4
- C.
  
  29 × 10^-4
- D.
  
  0.029 × 10^-4
3.

The yield of the product will be higher if the value of K is
- A.
  
  1 × 10^-15
- B.
  
  1 × 10 ^-12
- C.
  
  5 × 10⁸
- D.
  
  1 × 10^-7
4.

If 0.5 mole H₂ is reacted with 0.5 mole I₂ in a ten-litre container at 444^oC and at same temperature value of equilibrium constant K_c is 49, the ratio of [HI] and [I₂] will be:
- A.
  
  7
- B.
  
  1/7
- C.
  
  √1/7
- D.
  
  49
5.

One mole PCl₅ is heated in a closed container of one litre capacity. At equilibrium, 20% PCl₅ is not dissociated. What would be the value of K_c?
- A.
  
  32
- B.
  
  3.2
- C.
  
  2.4
- D.
  
  42
6.

How many moles per liter of PCl₅ has to be taken to obtain 0.1 mole Cl₂, if the value of equilibrium constant K_c is 0.04?
- A.
  
  0.15
- B.
  
  0.25
- C.
  
  0.35
- D.
  
  0.45
7.

For a reaction N₂+3H₂⇌2NH₃, the value of K_c depends upon:
- A.
  
  Temperature
- B.
  
  Catalyst
- C.
  
  Pressure
- D.
  
  Concentration
8.

For a any reversible reaction. If increases concentration of reactants. Then effect on equilibrium constant :
- A.
  
  Depends on the concentration
- B.
  
  Increases
- C.
  
  Decreases
- D.
  
  Unchanged
9.

Which of the following explains the effect of a catalyst on the rate of a reversible reaction?
- A.
  
  It gives new reaction path with low activation energy
- B.
  
  It shifts equilibrium to right side
- C.
  
  It decreases the kinetic energy
- D.
  
  It decreases the rate of backward reaction
10.

if some he gas is introduced into equilibrium pcl₅=pcl₃+cl₂ at const pressure and temp then k_c will:
- A.
  
  Increase
- B.
  
  Decrease
- C.
  
  Unchanged
- D.
  
  None of the above
11.

In a chemical equilibrium A+B⇌C+D when one mole each of the two reactants are mixed, 0.4 mole each of the products are formed.The equilibrium constant calculated is
- A.
  
  1
- B.
  
  0.36
- C.
  
  2.25
- D.
  
  4/9
12.

Evaluate Kp for the reaction : H₂+I₂⇌2HI. 2 moles each of H₂ and I₂are taken initially equilibrium moles of HI are 2 :
- A.
  
  2.5
- B.
  
  4
- C.
  
  0.25
- D.
  
  1
13.

The equilibrium 2SO₂(g)+O₂(g)⇌2SO₃(g) shifts forward if:
- A.
  
  Catalyst is used
- B.
  
  Adsorbent to remove SO₃
- C.
  
  Small amount of reactant are used
- D.
  
  None
14.

For the equilibrium reaction, H₂O(l)⇌H₂O(g), what happens, if pressure is increased.
- A.
  
  More water evaporates
- B.
  
  Boiling point of water is increased
- C.
  
  No effect
- D.
  
  None
15.

For the equilibrium, 2NOCl(g) ⇌ 2NO(g) + Cl₂(g) the value of the equilibrium constant, K_c is 3×10^–6 at 1069 K. Calculate the K_p for the reaction at this temperature?
- A.
  
  7.5 × 10^-5
- B.
  
  2.5 × 10^-5
- C.
  
  2.5 × 10^-4
- D.
  
  1.75 × 10^-4
16.

The unit of ionic product of water K_w is:
- A.
  
  Mol^-1L^-1
- B.
  
  Mol^-2L^-2
- C.
  
  Mol^-2 L^-1
- D.
  
  Mol²L^-2
17.

The common ion effects is shown by which of the following sets of solutions:-
- A.
  
  NH₄OH+NH₄Cl
- B.
  
  BaCl₂ + Ba(NO₃)₂
- C.
  
  NaCl + HCl
- D.
  
  None
18.

The number of milli equivalents in 100 ml solution of 0.5 N HCl
- A.
  
  100
- B.
  
  50
- C.
  
  150
- D.
  
  200
19.

The process of Neutralization invariably depends on:-
- A.
  
  H+ ions
- B.
  
  OH- ions
- C.
  
  Both
- D.
  
  Molecules of water
20.

If s and S are respectively solubility and solubility product of a sparingly soluble binary electrolyte then:
- A.
  
  S = S
- B.
  
  S = S^1/2
- C.
  
  S = S²
- D.
  
  S = 1/2 S
21.

Assertion: For the reaction H₂+ I₂⇌ 2HI ,K_p=K_c. Reason- K_p for all gaseous reaction is equal to K_c. Choose the answers appropriately. A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.
- A.
  
  A
- B.
  
  B
- C.
  
  C
- D.
  
  D
22.

Assertion: Effect of temperature on Kc and Kp depends on enthalpy change. Reason: Increase in temperature shifts the equilibrium position to the product side in endothermic direction. Choose the answers appropriately. A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Asertion is True but Reason is False. D : If both Assertion and Reason are False.
- A.
  
  A
- B.
  
  B
- C.
  
  C
- D.
  
  D
23.

For the reaction at certain temperature A(g)+B(g)⇌C(g), there will be no effect by addition of inert gas at constant volume. REASON Equilibrium constant depends only on temperature. Choose the answers appropriately. A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.
- A.
  
  A
- B.
  
  B
- C.
  
  C
- D.
  
  D
24.

8 g NaOH is dissolved in one litre of solution, the molarity of the solution is
- A.
  
  0.2 M
- B.
  
  0.4 M
- C.
  
  0.6 M
- D.
  
  0.8 M
25.

Which of the following has maximum solubility?
- A.
  
  PbSO₄(Ksp=1.3×10⁻⁸⁾
- B.
  
  HgS ( Ksp = 1.6 × 10^-54)
- C.
  
  ZnS ( Ksp = 7.0 × 10^-26)
- D.
  
  AuCl ( Ksp = 1.7 × 10^-10)