XI Chemistry Electrochemistry Online Test Mdcat-2024

Instructions for Chapter Electrochemistry Online Test Mdcat-2024:

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Test Details:

Subject: Chemistry
Class: 1st year or 11
Chapter name: Electrochemistry
Test: MDCAT 2024
Book: Sindh Textbook
Total No. Of MCQS: 50
Time Allowed: 50 Minutes
Price : Free

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Created on July 27, 2024 By

medicoengineer.com

XI Chemistry Electrochemistry Online Test Mdcat-2024

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NameEmailPhone Number

1 / 50

1. If one species in a reaction loses electrons, it is said to be __ and acts as ___

a) Reduced, Oxidizing agent

b) Reduced, Reducing agent

c) Oxidized, Reducing agent

d) Oxidized, Oxidizing agent

2 / 50

2. Which of the following is not an redox reaction?

a) Rusting of iron

b) Photosynthesis

c) Generation of electric current in batteries

d) All are redox reactions

3 / 50

3. What truly does the reduction describe?

a) Addition of oxygen

b) Removal of Hydrogen

c) Addition of Hydrogen

d) Both A and B

4 / 50

4. Select the incorrect statement.

a) Oxidation state of an element increases in oxidation

b) Oxidation state only changes in oxidation

c) Value of Oxidation number may be zero, negative or positive

d) None, as all are correct

5 / 50

5. Oxidation number of oxygen in peroxides and superoxides is, respectively

a) -0.5,-1

b) -1,-2

c) -1,-0.5

d) -1,+2

6 / 50

6. Select the incorrect statement

a) Oxidation number of all elements in free state is taken as zero

b) Sum of oxidation numbers of all elements in neutral compounds is zero

c) In metal hydrides oxidation number of hydrogen is taken as -1

d) None, as all are correct

7 / 50

7. Oxidation number of S in Na₂S₂O₃

a) +6

b) +2

c) -2

d) +4

8 / 50

8. Oxidation number of Nitrogen in laughing gas

a) +4

b) +2

c) +1

d) -4

9 / 50

9. In the redox reaction :

Fe₂O₃ + 3CO ----> 2Fe + 3CO₂

Which is an oxidizing agent and A reducing agent respectively.

a) CO ; Fe₂O₃

b) Fe₂O₃ ; CO

c) CO is reducing as well as oxidizing agent.

d) Can't be predicted

10 / 50

10. In a neutral or acidic medium ____and ______ are added to balance oxygen and hydrogen respectively.

a) H₂O;H+

b) H+; H₂O

c) OH־ ; H₂O

d) H₂O ; OH־

11 / 50

11. Which of the following statements is true for a galvanic cell?

a) The anode is positive.

b) The cathode is positive

c) Electrons flow from the cathode to the anode.

d) The cathode undergoes oxidation.

12 / 50

12. In a standard hydrogen electrode (SHE), the electrode potential is considered to be:

a) 0.00 V

b) 1.00 V

c) 0.76 V

d) -0.76 V

13 / 50

13. What is the role of salt bridge?

a) It maintains the electrical neutrality

b) Allows the flow of ions

c) Prevents the mixing of solution

d) All of these

14 / 50

14. Select the correct statement when electric current is passed through solution:

a) Anions move towards cathode

b) Cations move towards cathode and get oxidized

c) Anions move towards anode to get oxidized

d) None

15 / 50

15. In electrolytic solution cathode is ____ electrode and so _____ occurs

a) Positive, Oxidation

b) Positive, Reduction

c) Negative, Oxidation

d) Negative, Reduction

16 / 50

16. In an electrolytic cell, the anode is:

a) Negative

b) Neutral

c) Positive

d) Either positive or negative depending on the electrolyte

17 / 50

17. In an electrolytic cell conduction of current is due to

a) Electrons

b) Cations and Anions

c) Electrodes

d) None

18 / 50

18. In an electrochemical series, the metal with the highest negative reduction potential is:

a) The best oxidizing agent

b) The best reducing agent

c) The most noble metal

d) The least reactive metal

19 / 50

19. In a galvanic cell, the species that undergoes reduction is:

a) The species at the anode

b) The species at the cathode.

c) The species in the salt bridge

d) The electrolyte.

20 / 50

20. Select the correct statement.

a) The two electrodes in galvanic cell are connected externally through salt bridge

b) Generation of current in Galvanic cell is non-spontaneous

c) An inert electrolyte is filled along with gel in salt bridge

d) Both A and C

21 / 50

21. Select the correct statement

a) Electrode potential is the ability of cell to push electrons through the external circuit

b) Electrode potential is the potential difference between the two electrodes in a voltaic cell

c) Oxidation potential is taken as Standard electrode potential Oxidation potential is taken as Standard electrode potential

d) Both A and B

22 / 50

22. While constructing a Galvanic cell:

a) Cathode should be of higher oxidation potential

b) Cathode should be of lower reduction potential

c) Anode should be of higher oxidation potential

d) Anode should be of higher reduction potential

23 / 50

23. Voltaic cell was first developed by

a) Michael Faraday

b) Alessandro Volta

c) Luigi Galvani

d) Humphry Davy

24 / 50

24. What were the materials used by to create first voltaic cell?

a) Zinc and copper plates separated by salt water

b) Copper and silver plates separated by vinegar

c) Zinc and silver plates separated by paper soaked in saltwater

d) Iron and lead plates separated by sulfuric acid

25 / 50

25. Which is not correct for SHE :

a) It is a gas electrode

b) It consists of platinum rod

c) Platinum rod is immersed in 1M solution of H₂SO₄

d) None, as all are correct

26 / 50

26. In SHE, If oxidation takes place at platinum electrode, it serves as _ but if reduction occurs it serves as _

a) Cathode, Anode

b) Anode, Cathode

c) Anode, Anode

d) Cathode, Cathode

27 / 50

27. In Zinc-SHE voltaic cell

a) Electrons originate at zinc

b) Electrons originate at SHE

c) Electrons originate at cathode

d) None

28 / 50

28. Standard electrode potential of Galvanic cell can be expressed as

a) E°cell= E°(anode) - E°(cathode)

b) E°cell= E°anode + E°cathode

c) E°cell=E°cathode - E°anode

d) None

29 / 50

29. In a Comparison cell if element or metal placed below hydrogen in electrochemical series is taken then:

a) Hydrogen will act as cathode

b) Hydrogen acts as Anode

c) The metal undergo oxidation

d) Hydrogen undergo reduction

30 / 50

30. In ECS, going from top to bottom which is not true:

a) Reducing power decreases

b) Elements tendency to get oxidized reduces

c) Oxidizing Power increases

d) All are true

31 / 50

31. Which of the following is strong reducing agent

a) Li

b) F₂

c) Cu

d) Zn

32 / 50

32. Which of the following is the strong oxidizing agent?

a) Li

b) F₂

c) Cu

d) O₂

33 / 50

33. The standard electrode potential of F₂ is:

a) +2.87

b) -3.05

c) +3.05

d) -2.87

34 / 50

34. Which of the following statement is true for electrodes which are placed above.hydrogen in ECS

a) They have positive electrode potential

b) They have stronger tendency to gain electron

c) They act as reducing agents(anode)

d) All of them

35 / 50

35. Galvanic cells in battery are connected in:

a) Series

b) Parallel

c) Sometimes paralles, sometimes in series

d) None

36 / 50

36. Which of the following type of battery cannot be recharged?

a) Primary Battery

b) Secondary Battery

c) All batteries can be recharged

d) Fuel cell

37 / 50

37. Why dry cell cannot be reused?

a) Because redox reaction takes place in two direction

b) Because redox reaction cannot be reversed

c) Due to presence of graphite.

d) Both A and B

38 / 50

38. The outer body of dry cell is made up of

a) Graphite

b) Zinc

c) MnO₂

d) ZnCl₂

39 / 50

39. In dry cell:

a) Zinc serves as cathode

b) Graphite serves as anode

c) Graphite serves as cathode

d) Outer body is made up of MnO₂

40 / 50

40. A 12 volt car battery is made up of _ galvanic cells connected in series each of which has an emf of ___.

a) 12,2 volt

b) 2,12 volt

c) 6,2 volt

d) 6, 1 volt

41 / 50

41. In lead storage battery:

a) Anode plates are made up of Pb

b) Cathode plates are coated with PbO₂

c) Specific gravity of H₂SO₄ is 1.25

d) All of them

42 / 50

42. Lead storage battery can be recharged by connecting :

a) Anode to negative terminal.

b) Cathode to positive terminal

c) Cannot be recharged

d) Both A and B

43 / 50

43. The overall result of the fuel cell reaction is:

a) Hydrogen is released

b) Water is released

c) Electricity is produced

d) Both B and C

44 / 50

44. Fuel cell is based on the reaction between:

a) Hydrogen and Carbon

b) Hydrogen and Oxygen

c) Nitrogen and Oxygen

d) Nitrogen and Hydrogen

45 / 50

45. Which of the following is not correct regarding fuel cell reaction?

a) It consists both electrodes of carbon coated with Platinum

b) Platinum serves as catalyst

c) KOH works as electrolyte

d) None, as all are correct

46 / 50

46. In Galvanizing which metal is used for coating iron?

a) Fe

b) Zn

c) Sn

d) Al

47 / 50

47. Coating of one metal on the surface of another by means of electrolysis:

a) Galvanizing

b) Electroplating

c) Corrosion

d) Alloying

48 / 50

48. If aqueous NaCl is taken as an electrolyte for electrolysis then the product on cathode will be?

a) Na

b) Cl

c) H₂

d) O₂

49 / 50

49. Oxidation number of Sulphur in Oleum:

a) +12

b) +6

c) +3

d) -3

50 / 50

50. The oxidation number of Cr in K₂Cr₂O₇:

a) +12

b) +6

c) +3

d) -6

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