MDCAT XI Chemistry Electrochemistry Online Test-2

156

Created on July 03, 2025 By

📚 Test Details

Subject: Chemsitry
Class: 1st year / XI
Chapter: Electrochemistry
Test: 2
Book: Sindh Textbook
Total No. Of MCQs: 50 MCQs
Time Allowed: 50 Minutes

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1 / 50

1. In a galvanic cell, the electrons flow from.

a) Anode to cathode through the solution

b) Anode to cathode through the external circuit

c) Cathode to anode through solution

d) Cathode to anode through the external circuit

2 / 50

2. The cathodic standard reduction potential minus anodic standard reduction potential is equal to:

a) Cell intensity

b) Cell gradient

c) Cell potential

d) Cell power

3 / 50

3. The electrode potential measures:

a) Tendency of the electrode to gain or lose electrons.

b) Electron affinity for elements.

c) Difference in the ionization potential of electrode and metal ion.

d) Heat from combustion

4 / 50

4. Which of the following statements is correct?

a) The cathode is -ve terminal in both galvanic and electrolytic cells

b) The anode is +ve terminal in both galvanic and electrolytic cells

c) The cathode and anode are -ve terminals in an electrolytic and galvanic cell respectively.

d) The cathode and anode are +ve terminals in electrolytic and galvanic cell respectively

5 / 50

5. In a galvanic cell, the salt bridge is used to:

a) To produce current at a constant strength.

b) Facilitate the continuity of the cell reaction

c) Prevent the accumulation of charges around the electrodes.

d) All of these

6 / 50

6. Which has maximum oxidation number

a) N

b) Cr

c) S

d) Mn

7 / 50

7. Potential of SHE is considered as______.

a) zero

b) unity

c) constant

d) multiple of 1

8 / 50

8. Secondary cell is_______.

a) Electrolytic

b) Non rechargeable

c) Rechargeable

d) May be recharge may be not

9 / 50

9. Apparent charge on atom in molecule is_____.

a) valency

b) coordination number

c) oxidation number

d) charge number

10 / 50

10. The reduction potential Zn is_______.

a) 0.76

b) -0.76

c) -0.55

d) 0.55

11 / 50

11. In a galvanic cell______?

a) Chemical energy is converted into electricity

b) Chemical energy is converted into heat

c) Electrical energy is converted into chemical energy

d) Electrical energy is converted into heat

12 / 50

12. Chemical used in salt bridge is______.

a) KOH

b) KCI

c) KNO₃

d) KBr

13 / 50

13. H₂ gas in SHE is filled at pressure of_____

a) 760mm of Hg

b) 750mm of Hg

c) 780mm of Hg

d) 800mm of Hg

14 / 50

14. The pair of ions having same electronic configuration and same oxidation number

a) Cr³⁺, Fe²⁺

b) Fe, Mn²⁺

c) Fe³⁺, Co³⁺

d) Sc, Cr⁺

15 / 50

15. Which are of the following reaction does not involve either oxidation or reduction.

a) VO₂⁺ ⟶ V₂O₃

b) Na ⟶ Na⁺

c) CrO₄²⁻ ⟶ Cr₂O₇²⁻

d) Zn² ⟶ Zn⁺

16 / 50

16. A galvanic cell, the electrons flow from.

a) Anode to cathode through the solution

b) Anode to cathode through the external circuit

c) Cathode to anode through solution

d) Cathode to anode through the external circuit

17 / 50

17. Oxidation state of oxygen is -1 in the compound.

a) H₂O

b) BaO₂

c) KO₂

d) Li₂O

18 / 50

18. The function of salt bridge in the galvanic or voltaic cell is to:

a) Carry out oxidation at anode

b) To carry out reduction at cathode

c) Carry out electrolysis

d) To prevent the net charge accumulation in either of the half cells

19 / 50

19. Electrodes below hydrogen in ECS have.

a) Negative value of reduction potential

b) Positive value of oxidation potential

c) Positive value of reduction potential

d) Greater tendency to lose electrons

20 / 50

20. Zn + 2HCl ⟶ ZnCl₂ + H₂

In the above reactions.

a) Zn is reduced and HCI is oxidized

b) Zn and HCI are neither oxidized nor reduced

c) Zn is oxidizing agent and HCI is reducing agent

d) Zn is oxidized and hydrogen is reduced

21 / 50

21. Find the strongest reducing agent in the series is

a) F₂

b) Li

c) Mg

d) O₂

22 / 50

22. Stronger the reducing agent lesser the is the.

a) Oxidation potential

b) Reduction potential

c) Redox potential

d) E.M.F of cell

23 / 50

23. The cathode product in electrolysis of aqueous solution of NaNO₃, is.

a) Na metal

b) O₂

c) NO₂

d) H₂

24 / 50

24. In voltaic cell carhode is.

a) -ve

b) +ve

c) Neutral

d) None of these

25 / 50

25. Ered Sn*2/Sn = -0.14V,

Ered Mg²/Mg = -2.38V

a) Sn²⁺ can Oxidize Mg

b) Mg²⁺ can oxidize Sn

c) Both can oxidize other

d) Both can reduce each other

26 / 50

26.

Co³⁺ + e⁻ → Co²⁺ ; E° = +1.81 V
Pb⁴⁺ + 2e⁻ → Pb²⁺ ; E° = +1.67 V
Ce⁴⁺ + e⁻ → Ce³⁺ ; E° = +1.61 V
Bi³⁺ + 3e⁻ → Bi ; E° = +0.20 V

Oxidizing power of the species will increase in the order.

a) Ce⁴⁺ < Pb⁴⁺ < Bi³⁺ < Co³⁺

b) Bi³⁺ < Ce⁴⁺ < Pb⁴⁺ < Co³⁺

c) Co³⁺ < Pb⁴⁺ < Ce⁴⁺ < Co³⁺

d) Co³⁺ < Ce⁴⁺ < Bi³⁺ < Pb⁴⁺

27 / 50

27. Choose the best having non zero standard enthalpy

a) O₃

b) HCl

c) N₂

d) Ne

28 / 50

28.

Sn²⁺ + 2e⁻ ⟶ Sn ; E = –0.14 V
Fe²⁺ + 2e⁻ ⟶ Fe⁰ ; E = –0.44 V
Sn + Fe²⁺ ⟶ Fe⁰ + Sn²⁺

Find the out the value of E-cell also determine the reaction is spontaneous or non- spontaneous.

a) E cell = 0.30 (spontaneous)

b) E cell = –0.58 (non spontaneous)

c) E cell = –0.30 (non spontaneous)

d) E cell = + 0.58 (spontaneous)

29 / 50

29. H₂O₂ + 2H⁺ + X ⟶ 2H₂O the value of X is.

a) 1e

b) 2e-

c) 3e-

d) 4e-

30 / 50

30. Galvanizing is the process in which ____ is used.

a) Tn

b) Pb

c) Zn

d) Hg

31 / 50

31. Corrosion is an electrochemical process in which metal atom serve as

a) Anode

b) Cathode

c) Used for electrolyte

d) A and B

32 / 50

32. The mixture used for electrolytic process is

a) HCl, SnCl

b) HCl, H₂SO₄

c) SnCl₂ , HCl

d) HNO₃, HCl

33 / 50

33. Graphite located at the center of dry cell serve as

a) Cathode

b) Anode

c) Serve in denuder

d) Used for Solution

34 / 50

34. Dry cell produces _____ of direct current (DC).

a) 2volts

b) 1.5volts

c) 2.5volts

d) 1volt

35 / 50

35. Voltaic cell was first discovered by Alexander volta he used two plates made up of

a) Zn , Pb

b) Zn , Hg

c) Ag , Zn

d) Zn , Fe

36 / 50

36. Oxidation number of oxygen in Na₂O₂____.

a) + 2

b) -1

c) +0.5

d) -2

37 / 50

37. The oxidation number of hydrogen in ionic compound

a) +2

b) +1

c) -2

d) +4

38 / 50

38. I have a dark green suit , and i washed it lefibin sunlight to make it dry , but due to excessive sunlight it convert into light green because

a) Radiation cause substitution reaction

b) Bexause of low quality cloth

c) There is redox reaction occur in it

d) Dont have proper answer in these

39 / 50

39. In neutral and basic medium oxygen are balanced by

a) H₂O, H₂O

b) H₂O, OH^-

c) OH^-, OH^-

d) OH^-, H₂O

40 / 50

40. In Galvanic cell electrons flow from anode to cathode through______.

a) external electric circuit

b) salt bridge

c) movement of ions

d) all of the above

41 / 50

41. Electricity in voltaic cell is produced due to____.

a) Oxidation

b) Neutralization

c) reduction

d) Both A & C

42 / 50

42. Which of the following has maximum oxidation number

a) Cl₂

b) O₂

c) N₂

d) All have sameoxidation number

43 / 50

43. In a galvanic cell_______.

a) Chemical energy is converted into electricity

b) Chemical energy is converted into heat

c) Electrical energy is converted into chemical energy

d) Electrical energy is converted into heat

44 / 50

44. Which of the following is given to a fuel cell’s cathode?

a) Hydrogen

b) Nitrogen

c) Oxygen

d) Chlorine

45 / 50

45. In a fuel cell, which of the following can be utilized as a fuel?

a) Nitrogen

b) Argon

c) Hydrogen

d) Helium

46 / 50

46. The process of transmitting electric current through an electrolyte’s solution to decompose it is known as ______.

a) Electrolyte

b) Electrode

c) Electrolysis

d) Electrochemical cell

47 / 50

47. The conductivity of electrolytic conductors is due to ______.

a) Flow of free mobile electrons

b) Either movement of electrons or ions

c) movement of ions

d) Cannot be said

48 / 50

48. Which of the following statements about a lead storage cell (or a lead-acid battery) is false?

a) It is a primary cell

b) The cathode is made up of lead(IV) oxide

c) The anode is made up of lead

d) The electrolyte used is an aqueous solution of sulphuric acid

49 / 50

49. Pick the correct option of the following

a) Cell potential is an extensive property

b) Cell potential is an intensive property

c) The Gibbs free energy of an electrochemical cell is an intensive property

d) Gibbs free energy is undefined for an electrochemical cell

50 / 50

50. Which of the following claims about the cathode is correct?

a) Oxidation occurs at the cathode

b) Electrons move into the cathode

c) Usually denoted by a negative sign

d) Is usually made up of insulating material

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MDCAT XI Chemistry Electrochemistry Online Test-2

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