Chemistry Chemical Equilibrium Online Mcqs Test

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Question 1

1. An equilibrium constant of 10¯⁴ for a reaction means that the reaction is

Answer

One that is very favorable and will have mostly product at equilibrium

Answer

The equilibrium constant only relates to the speed of a reaction and not to the amount of product formed

Answer

One that is unfavourable and will not have very much product at equilibrium

Answer

One that will have 50% product and 50% reactant at equilibrium

Question 2

2. When pressure is applied to the equilibrium system Ice ⇌ Water? Which of the following phenomenon will happen?

Answer

Water will evaporate

Answer

More ice will be formed

Answer

Equilibrium will not be formed

Answer

More water will be formed

Question 3

3. Reaction which proceed in both the directions is called

Answer

Reversible

Answer

Non spontaneous

Answer

Irreversible

Answer

Spontaneous

Question 4

4. A buffer solution can be prepared by mixing

Answer

A weak base and its salt with strong acid

Answer

A strong acid and its salt

Answer

A strong acid and weak base

Answer

A weak acid and weak base

Question 5

5. In an exothermic reversible reaction increase in temp shifts the equilibrium to

Answer

Reactant side

Answer

Product side

Answer

Remains unchanged

Question 6

6. A basic Buffer solution can be prepared by mixing

Answer

Strong acid and its slat wit weak base

Answer

Weak base and its salt with strong acid

Answer

Strong base and its salt with weak acid

Answer

Weak acid and its slat with strong base

Question 7

7. The relationship between Kp and Kc is give by

Answer

Kc = Kp (RT)∆n

Answer

Kp = Kc (RT)∆

Answer

Kp = Kc (RT)-∆n

Answer

Kp = Kc (RT)∆n

Question 8

8. The rate at which a substance reacts is directly proportional to its active mass and the rate of reaction is directly proportional to the product of the active mass of reacting substances is known as

Answer

Law of conservation of energy

Answer

Le – Chatelier’s principle

Answer

None of all

Answer

Law of mass action

Question 9

9. The reaction 2SO₂ + 2O₂ ⇌ 2SO will be favoured by

Answer

High temperature and low pressure

Answer

Low temperature and low pressure

Answer

High temperature and high pressure

Answer

Low temperature and high pressure

Question 10

10. What can affect the magnitude of equilibrium constant Kp of a reversible gaseous reaction

Answer

Temperature

Answer

None of these

Question 11

11. Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution?

Answer

0.4 mole of CH3COOH with 0.4 mole of NaOH

Answer

0.0002M HCl

Answer

0.4 mole of NH3 with 0.2 mole of HCl

Answer

0.2 mole of NaCl with 0.2 mole of HNO3

Question 12

12. When sparingly soluble salt is in equilibrium with molar concentration of its oppositely charged ion when the product is called

Answer

Dissociation constant for an acid

Answer

Common ion effect

Answer

Dissociation constant

Answer

Solubility product

Question 13

13. Chemical equilibrium is referred to as dynamic because, at equilibrium, the

Answer

Reactants and products keep reacting

Answer

Concentrations of the reactants and products continue to change

Answer

Equilibrium constant changes

Answer

Rates of the forward and backward reactions change

Question 14

14. For a reaction H₂ + I₂ ⇌ 2HI at 721 K, the value of equilibrium constant is 50. If 0.5 moles each of H₂ and I₂ is added to the system the value of equilibrium constant will be

Question 15

15. In an exothermic reaction, a 10° rise in temperature will

Answer

Decrease the value of equilibrium constant

Answer

Double the value of Kc

Answer

Not produce any change in Kc

Answer

Produce some increase in Kc

Question 16

16. For the reaction 2A(g) + B(g) ⇌ 3C(g) + D(g) two moles each of A and B were taken into a flask. The following must always be true when the system attained equilibrium

Question 17

17. Kc > Products / Reactants favours

Answer

Reaction completed

Answer

Forward reaction

Answer

Backward reaction

Answer

Equilibrium

Question 18

18. If rate of concentration of reaction is equal to rate of concentration of products in reversible reaction the __________

Answer

Reaction goes forward

Answer

Equilibrium will established

Answer

Reaction stops after some time

Answer

Reaction goes backward

Question 19

19. Which pH is considered as basic?

Question 20

20. When ever a week a base is dissolved in water, it gives its conjugate acid similarly a weal acid in water products its conjugate base. The conjugate acid base pair is stated by

Answer

Common on effect

Answer

Le – Chatelier’s principle

Answer

Lowery Bronsted concept

Answer

Law of mass action

Question 21

21. In a chemical reaction N₂ + 3H₂ ⇌ 2NH₃ at equilibrium point

Answer

The same amount of ammonia is formed as is decomposed into N₂ and H₂

Answer

The reaction has stopped

Answer

Equal masses of N₂ and H₂ are reacting

Answer

Equal volumes of N₂ and H₂ are reacting

Question 22

22. Water and ice are in equilibrium at 0C° and pressure is applied at this stage, then

Answer

More ice is formed

Answer

Water evaporates

Answer

Equilibrium is not disturbed

Answer

More water is formed

Question 23

23. When H₂ and I₂ are mixed and equilibrium is attained, then

Answer

HI dissociation stops

Answer

The reaction stops completely

Answer

Amount of HI formed is equal to the amount of H₂ dissociated

Answer

None of these

Question 24

24. AgCl dissolved with cone (2 x 10¯²) Ksp will be

Answer

3.6 x 10¯⁵

Answer

3.6 x 10¯⁶

Answer

4 x 10¯⁴

Answer

7.2 x 10¯⁶

Question 25

25. The rate of chemical reaction is directly proportional to the active mass of reactant this statement is known as ___________

Answer

None of these

Answer

Law of Mass Action

Answer

Law of reaction

Answer

Law of Equilibrium

Question 26

26. Synthesis of ammonia by Habor process is an example of ___________

Answer

Decomposition Reaction

Answer

Reversible Reaction

Answer

Constant Reaction

Answer

Irreversible Reaction

Question 27

27. The state of equilibrium refers to

Answer

State or rest

Answer

Stationary state

Answer

Dynamic state

Answer

State of inertness

Question 28

28. The product of [0H¯][H⁺] at 25C° is

Question 29

29. Le-Chatelier’s principle is sometime known as

Answer

Law of active mass

Answer

All of these

Answer

Law of mass action

Answer

Law of mobile equilibrium

Question 30

30. In reversible reactions, if the forward reaction occur very fast then reactant (s) is (are) __________

Answer

At very high temperature

Question 31

31. Conjugate base of a very weak acid is

Answer

Do not ionize

Answer

Strong base

Question 32

32. When rate of forward reaction is equal to rate of backward reaction, then the equilibrium established is called

Answer

Dynamic equilibrium

Answer

Static equilibrium

Answer

Chemical equilibrium

Answer

None of all

Question 33

33. In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled then the equilibrium constant will

Answer

Remains the same

Answer

Also be doubled

Answer

Becomes one fourth

Question 34

34. What is the relationship between kp and kc?

Answer

kp = kc (RT)∆n

Answer

kc = kp (P)-∆n

Answer

Kc - kp (RT)∆n

Answer

kp = kc (RT)-∆n

Question 35

35. When pressure is applied to the given equilibrium ice water which of the following will happen

Answer

More ice will be formed

Answer

Equilibrium will not be disturbed

Answer

More water will be formed

Answer

Water will formed

Question 36

36. At start of reaction, concentration of reactants are on

Answer

Higher side

Answer

Optimum side

Answer

Lower side

Question 37

37. In reversible reaction the changes in forward and backward reaction occur _________

Answer

Individually

Answer

Simultaneously

Answer

Both a and b

Question 38

38. A chemical reaction A ⇌ B is said to be in equilibrium when

Answer

Conversion of A to B is only 50% complete

Answer

The rate of transformation of A to B is just equal to rate of transformation of B to A in the system.

Answer

Complete conversion of A to B has taken place

Answer

Only 10% conversion of A to B has taken place

Question 39

39. The equilibrium constant in a reversible chemical reaction at a given temperature

Answer

Depends on the initial concentration of the reactants

Answer

Depends on the concentration of one of the products at equilibrium

Answer

Does not depend on the initial concentrations of reactants

Answer

Is not characteristic of the reaction

Question 40

40. Two moles of HI was heated in a sealed tube at 440°C till the equilibrium was reached. HI was found to be 22% decomposed. The equilibrium constant for dissociation is

Question 41

41. Which of the following gives a basic buffer?

Answer

NaOH + CH₃ COONa

Answer

NaCl + CH₃ COOH

Answer

NH₄OH + NH₄Cl

Answer

NaOH + NaCl

Question 42

42. Preparation of buffer solution can be done by mixing

Answer

Weak base and its salt with strong acid

Answer

Strong base and its salt with weak acid

Answer

Weak acid and its salt with weak base

Answer

Strong acid and its salt with weak base

Question 43

43. Addition of CH3COOH and CH3COONa gives in water

Answer

Buffer solution

Answer

Both b and c

Answer

Standard solution

Answer

Acidic buffer solution

Question 44

44. The equilibrium will shift towards right by increasing ___________ of reactants

Answer

Concentration

Answer

Temperature

Question 45

45. Which of the following is more acidic?

Question 46

46. Temperature for preparation of SO₃ is

Answer

400 – 500 °C

Question 47

47. At certain temperature, 50% of HI is dissociated into H₂ and I₂ the equilibrium constant is

Question 48

48. In which of the following cases, the reaction goes farthest to completion?

Answer

K = 10¯²

Question 49

49. PH of human blood is

Question 50

50. Units of Kc is

Answer

Kc may or may not have units

Answer

Moles² dm⁺⁶

Answer

Moles⁺² dm¯⁶

Answer

Moles¯² dm⁺⁶

Question 51

51. Which statements are correct for a reaction at equilibrium?
(I) The forward and reverse reactions both continue
(II) The rates of the forward and reverse reactions are equal
(III) The concentrations of reactants and products are equal

Answer

I and III only

Answer

II and III only

Answer

I, II and III only

Answer

I and II only

Question 52

52. Which one of the following is a buffer solution?

Answer

Solution of CuSO4

Question 53

53. The factor which changes equilibrium constant o the reaction A₂(g) + B₂(g) → 2 AB(g) is

Answer

Temperature

Answer

Total pressure

Answer

Amounts of A₂ and B₂

Question 54

54. Solubility of any salt can be determined from

Question 55

55. Which of the following factors will favour the reverse reaction in a chemical equilibrium?

Answer

Increase in concentration of one of the products

Answer

Increase in concentration of one of the reactants

Answer

Removal of one of the products regularly

Answer

None of these

Question 56

56. If the value of kc is very low then the forward reaction will occur __________

Answer

Moderately

Question 57

57. By the addition of base in water pH will be

Answer

More than 7

Answer

Less than 7

Answer

Equal to 7

Question 58

58. Idea of PH and POH was put forward by

Question 59

59. If a buffer solution of higher PH than seven is to be made we use

Answer

Weak acid and its salt with a strong base

Answer

Weak acid and strong base

Answer

Strong acid and strong base

Answer

Weak base and its salt with a strong acid

Question 60

60. pH of milk is

Question 61

61. Who studied the effect of temperature on equilibrium?

Answer

Van der Waal

Question 62

62. Which of the following aqeous solution will be basic?

Answer

Na₂CO₃

Answer

Na₂SO₄

Answer

Fecl₃₋

Question 63

63. For equilibrium 2NO₂(g) ⇌ N₂O₄(g) + 14.6 kcal increase of temperature would

Answer

Not alter the equilibrium

Answer

Favour the formation of N₂O₄

Answer

Favour the decomposition of N₂O₄

Answer

Stop the reaction

Question 64

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Total Questions:	63
Time Allowed:	30 Minutes
Total Marks:	63
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Important Chemistry Chemical Equilibrium Question and Answer

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Malik Tahir

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