Chemical Equilibrium Exam Quiz!
25 Questions
| Total Attempts: 103
.
Questions and Answers
- 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 Kc for the reaction N2(g) + 3H2 (g) ⇌ 2 NH3 (g) is 0.65 at 300°C. Find the value of Kp 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 444oC and at same temperature value of equilibrium constant Kc 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 Kc?
- 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 Kc 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 Kc 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 kc 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 I2 are 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, Kc is 3×10–6 at 1069 K. Calculate the Kp 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 Kw is:
- A.
Mol-1 L-1
- B.
Mol-2 L-2
- C.
Mol-2 L-1
- D.
Mol2 L-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 = S1/2
- C.
S = S2
- D.
S = 1/2 S
- 21.Assertion: For the reaction H2 + I2 ⇌ 2HI ,Kp=Kc. Reason- Kp for all gaseous reaction is equal to Kc. 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)
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