Chemical Equilibrium Exam Quiz!

25 Questions | Total Attempts: 103

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Chemical Equilibrium Exam Quiz!

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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, H2​O(l)⇌H2​O(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. 

      MolL-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​ + I​⇌ 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. 
    AssertionEffect 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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