Chemistry Chemical Equilibrium Online Mcqs Test

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Question 1

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

Answer

Only 10% conversion of A to B has taken place

Answer

Complete conversion of A to B has taken place

Answer

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

Answer

Conversion of A to B is only 50% complete

Question 2

2. The state of equilibrium refers to

Answer

State or rest

Answer

State of inertness

Answer

Dynamic state

Answer

Stationary state

Question 3

3. Solubility of any salt can be determined from

Question 4

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

Answer

Remains unchanged

Answer

Reactant side

Answer

Product side

Question 5

5. Units of Kc is

Answer

Kc may or may not have units

Answer

Moles⁺² dm¯⁶

Answer

Moles¯² dm⁺⁶

Answer

Moles² dm⁺⁶

Question 6

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

Answer

Equilibrium is not disturbed

Answer

Water evaporates

Answer

More ice is formed

Answer

More water is formed

Question 7

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

Answer

Reaction stops after some time

Answer

Reaction goes backward

Answer

Reaction goes forward

Answer

Equilibrium will established

Question 8

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

Answer

Produce some increase in Kc

Answer

Double the value of Kc

Answer

Not produce any change in Kc

Answer

Decrease the value of equilibrium constant

Question 9

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

Answer

Law of reaction

Answer

Law of Equilibrium

Answer

None of these

Answer

Law of Mass Action

Question 10

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

Question 11

11. 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 12

12. PH of human blood is

Question 13

13. Preparation of buffer solution can be done by mixing

Answer

Weak acid and its salt with weak base

Answer

Strong acid and its salt with weak base

Answer

Weak base and its salt with strong acid

Answer

Strong base and its salt with weak acid

Question 14

14. 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

One that is unfavourable and will not have very much 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 will have 50% product and 50% reactant at equilibrium

Question 15

15. Which of the following is more acidic?

Question 16

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

Answer

Removal of one of the products regularly

Answer

Increase in concentration of one of the products

Answer

Increase in concentration of one of the reactants

Answer

None of these

Question 17

17. 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

None of all

Answer

Le – Chatelier’s principle

Answer

Law of mass action

Question 18

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

Answer

Equal volumes of N₂ and H₂ are reacting

Answer

The reaction has stopped

Answer

Equal masses of N₂ and H₂ are reacting

Answer

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

Question 19

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

Answer

Chemical equilibrium

Answer

Dynamic equilibrium

Answer

Static equilibrium

Answer

None of all

Question 20

20. Temperature for preparation of SO₃ is

Answer

400 – 500 °C

Question 21

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

Question 22

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

Answer

Total pressure

Answer

Temperature

Answer

Amounts of A₂ and B₂

Question 23

23. 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 24

24. Who studied the effect of temperature on equilibrium?

Answer

Van der Waal

Question 25

25. pH of milk is

Question 26

26. A buffer solution can be prepared by mixing

Answer

A strong acid and its salt

Answer

A weak base and its salt with strong acid

Answer

A strong acid and weak base

Answer

A weak acid and weak base

Question 27

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

Answer

Moderately

Question 28

28. Reaction which proceed in both the directions is called

Answer

Spontaneous

Answer

Irreversible

Answer

Reversible

Answer

Non spontaneous

Question 29

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

Answer

Does not depend on the initial concentrations of reactants

Answer

Depends on the initial concentration of the reactants

Answer

Is not characteristic of the reaction

Answer

Depends on the concentration of one of the products at equilibrium

Question 30

30. What is the relationship between kp and kc?

Answer

kc = kp (P)-∆n

Answer

kp = kc (RT)∆n

Answer

kp = kc (RT)-∆n

Answer

Kc - kp (RT)∆n

Question 31

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

Answer

Irreversible Reaction

Answer

Decomposition Reaction

Answer

Reversible Reaction

Answer

Constant Reaction

Question 32

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

Answer

Concentrations of the reactants and products continue to change

Answer

Rates of the forward and backward reactions change

Answer

Reactants and products keep reacting

Answer

Equilibrium constant changes

Question 33

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

Answer

None of these

Answer

Temperature

Question 34

34. Addition of CH3COOH and CH3COONa gives in water

Answer

Both b and c

Answer

Standard solution

Answer

Acidic buffer solution

Answer

Buffer solution

Question 35

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

Answer

Low temperature and high pressure

Answer

Low temperature and low pressure

Answer

High temperature and high pressure

Answer

High temperature and low pressure

Question 36

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

Answer

At very high temperature

Question 37

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

Answer

Equal to 7

Answer

More than 7

Answer

Less than 7

Question 38

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

Answer

Fecl₃₋

Answer

Na₂SO₄

Answer

Na₂CO₃

Question 39

39. 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

Water will formed

Answer

More water will be formed

Question 40

40. The relationship between Kp and Kc is give by

Answer

Kc = Kp (RT)∆n

Answer

Kp = Kc (RT)∆n

Answer

Kp = Kc (RT)∆

Answer

Kp = Kc (RT)-∆n

Question 41

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

Answer

Solution of CuSO4

Question 42

42. Which pH is considered as basic?

Question 43

43. 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 44

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

Answer

Also be doubled

Answer

Becomes one fourth

Answer

Remains the same

Question 45

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

Answer

Simultaneously

Answer

Individually

Answer

Both a and b

Question 46

46. 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

Law of mass action

Answer

Lowery Bronsted concept

Answer

Le – Chatelier’s principle

Answer

Common on effect

Question 47

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

Answer

K = 10¯²

Question 48

48. 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 49

49. Which of the following gives a basic buffer?

Answer

NaCl + CH₃ COOH

Answer

NH₄OH + NH₄Cl

Answer

NaOH + CH₃ COONa

Answer

NaOH + NaCl

Question 50

50. Idea of PH and POH was put forward by

Question 51

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

Answer

3.6 x 10¯⁵

Answer

4 x 10¯⁴

Answer

3.6 x 10¯⁶

Answer

7.2 x 10¯⁶

Question 52

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

Answer

Temperature

Answer

Concentration

Question 53

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

Answer

Lower side

Answer

Higher side

Answer

Optimum side

Question 54

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

Answer

The reaction stops completely

Answer

None of these

Answer

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

Answer

HI dissociation stops

Question 55

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

Answer

Solubility product

Answer

Dissociation constant for an acid

Answer

Dissociation constant

Answer

Common ion effect

Question 56

56. 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 57

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

Answer

Favour the formation of N₂O₄

Answer

Favour the decomposition of N₂O₄

Answer

Stop the reaction

Answer

Not alter the equilibrium

Question 58

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

Answer

Weak acid and strong base

Answer

Weak base and its salt with a strong acid

Answer

Strong acid and strong base

Answer

Weak acid and its salt with a strong base

Question 59

59. Conjugate base of a very weak acid is

Answer

Do not ionize

Answer

Strong base

Question 60

60. Kc > Products / Reactants favours

Answer

Equilibrium

Answer

Forward reaction

Answer

Reaction completed

Answer

Backward reaction

Question 61

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

Answer

0.2 mole of NaCl with 0.2 mole of HNO3

Answer

0.4 mole of NH3 with 0.2 mole of HCl

Answer

0.4 mole of CH3COOH with 0.4 mole of NaOH

Answer

0.0002M HCl

Question 62

62. 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 63

63. 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 II only

Answer

I, II and III only

Answer

II and III only

Answer

I and III only

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

Chemistry Chemical Equilibrium Practice Test Online With Explanation

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Malik Tahir

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