Exam-Style Mock Test | Class 11 Chemistry: Redox Reactions

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Quiz: Redox Reactions – Progressive Test
Total questions: 480
Questions in this round: 50
Time allotted: 70 minutes
Pass score: 60%
Total rounds: 10
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Quiz: Redox Reactions – Certificate Challenge
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Redox Reactions – Progressive Test

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1 / 50

1. For the reaction , using and , the standard cell potential is:

2 / 50

2. A learner calculates the oxidation number of iron in as by writing . The correction is:

a) use , because iron is a metal

b) use , because oxygen has charge

c) use , because there are two iron atoms

d) use , because the subscript on iron multiplies oxygen

3 / 50

3. Match each idea in Column I with its correct electron-transfer meaning in Column II.

Column I	Column II
P. Oxidation	1. Loss of electrons
Q. Reduction	2. Gain of electrons
R. Oxidising agent	3. Electron acceptor
S. Reducing agent	4. Electron donor

a) P-2, Q-1, R-4, S-3

b) P-4, Q-3, R-2, S-1

c) P-1, Q-2, R-3, S-4

d) P-3, Q-4, R-1, S-2

4 / 50

4. A half-reaction pair is multiplied before adding because:

a) reduction half-reactions must be written without charge

b) all coefficients in chemistry must be even numbers

c) coefficients must make the electrons cancel

d) oxidation half-reactions cannot contain ions

5 / 50

5. The standard reduction potentials are and . For the cell , is:

6 / 50

6. In the reaction , the electron transfer count is:

a) electrons lost and electrons gained

b) electrons lost and electrons gained

c) electrons lost and electrons gained

d) electrons lost and electrons gained

7 / 50

7. Match the electrode term in Column I with its meaning in Column II.

Column I	Column II
P. Anode	1. Electrode where oxidation occurs
Q. Cathode	2. Electrode where reduction occurs
R. Oxidation half-reaction	3. Electrons appear on product side
S. Reduction half-reaction	4. Electrons appear on reactant side

a) P-1, Q-2, R-3, S-4

b) P-2, Q-1, R-4, S-3

c) P-3, Q-4, R-1, S-2

d) P-4, Q-3, R-2, S-1

8 / 50

8. In the halogen order is more reactive than , and is more reactive than . Which reaction is expected to occur?

9 / 50

9. A bleaching process uses an oxidising substance to remove the colour of a dye. The redox interpretation is that the dye molecules are usually:

a) reduced by donating protons to water only

b) oxidised by the bleaching agent

c) converted into free elements only

d) unchanged in oxidation state

10 / 50

10. A reaction has the changes and . The reducing agent and oxidising agent are respectively:

a) and

b) and

c) and

d) and

11 / 50

11. The coefficient of in the acidic reaction of with is . The electron-balance reason is:

a) oxygen loses six electrons in the dichromate ion

b) dichromate gains six electrons; each loses one

c) each gains one electron, six in total

d) each chromium atom gains three electrons, six in total for dichromate

12 / 50

12. A reaction is called redox mainly because it involves what linked change?

a) Dissolving and crystallisation occurring in the same vessel

b) Heating and cooling occurring at equal rates

c) Colour change and gas evolution occurring together

d) Oxidation and reduction occurring together

13 / 50

13. For a monoatomic ion, the oxidation number is equal to:

a) its group number only

b) its atomic mass

c) its ionic charge

d) the number of atoms in its formula

14 / 50

14. A reaction changes into . Using oxidation numbers, this change is:

a) oxidation because the oxidation number increases from to

b) reduction because the oxidation number increases from to

c) no redox change because iron remains iron

d) oxidation because the oxidation number decreases from to

15 / 50

15. For , the coefficient required before after redox balancing is:

16 / 50

16. In acidic medium, oxidises according to . If of is mixed with of , the amount of left unreacted is:

17 / 50

17. An equation-balancing note says, “After electron balance, remaining atoms must still be balanced.” This is necessary because:

a) electron balance may leave some atoms unbalanced

b) oxidation numbers cannot be used for ionic equations

c) charge balance automatically changes molecular formulas

d) atom balance is not required if electrons cancel

18 / 50

18. The cell notation corresponds to which standard cell-potential expression?

19 / 50

19. A graph description is given for a working cell.

The x-axis shows time. One y-axis curve shows mass of zinc electrode, and another shows mass of copper electrode. The zinc curve slopes downward, while the copper curve slopes upward.

The graph is consistent with:

a) oxidation at zinc and reduction at copper

b) reduction at zinc and oxidation at copper

c) electron flow through the salt bridge

d) no redox reaction in either half-cell

20 / 50

20. A half-reaction in acidic medium is:

When this half-reaction is converted to basic medium, what is the first repair step?

a) Change into

b) Move to the product side

c) Remove without adding anything

d) Add to both sides

21 / 50

21. In , the oxidation number of oxygen is not found by using the ordinary oxide value . The best reason is:

a) contains two oxygen atoms, so each oxygen must be

b) is neutral, so every atom must have oxidation number

c) is a peroxide, where oxygen is assigned

d) contains hydrogen, so oxygen must be

22 / 50

22. The substance acting as the oxidising agent is identified by which oxidation-number change?

a) The product with the largest coefficient

b) The substance containing the atom whose oxidation number decreases

c) The reactant containing the maximum number of oxygen atoms in all cases

d) The substance containing the atom whose oxidation number increases

23 / 50

23. A solution is used in acidic medium, where . What volume of this solution contains equivalents of oxidising capacity?

24 / 50

24. In the oxidation-number method, a coefficient is first adjusted for the atom whose oxidation number changes because:

a) molecular formulas may be changed after oxidation numbers are assigned

b) increase and decrease in oxidation number must match

c) oxygen and hydrogen are ignored in all redox equations

d) unchanged atoms must never be balanced

25 / 50

25. In reductions, the product is important because:

a) it changes the atomic mass of manganese

b) it fixes the manganese oxidation-number change and -factor

c) it fixes for every medium

d) it makes the charge on disappear before reaction

26 / 50

26. An equivalent-based titration calculation says . This equality is valid at equivalence because:

a) oxidising and reducing equivalents are equal

b) volumes of the two solutions must always be equal

c) both solutions must have the same -factor

d) molarities must always be equal

27 / 50

27. Oxidation-number change can identify redox reactions because:

a) increase in oxidation number means oxidation and decrease means reduction

b) increase in oxidation number means reduction and decrease means oxidation

c) every reaction with oxygen is automatically non-redox

d) every reaction with ions is automatically non-redox

28 / 50

28. A reducing agent has molar mass . In a given reaction, one formula unit of loses electrons. What mass of contains equivalents?

29 / 50

29. The reaction is best classified as:

a) redox, because precipitation changes oxidation numbers

b) non-redox, because oxidation numbers do not change

c) redox, because silver changes from metal to ion

d) redox, because ion exchange always transfers electrons

30 / 50

30. In , the oxidation number of phosphorus is:

31 / 50

31. A compact oxidation-number comparison gives , , and . The oxidation numbers of oxygen are respectively:

32 / 50

32. Assertion: Every combination reaction is a redox reaction.
Reason: A combination reaction always forms only one product.

a) Assertion is false, but Reason is true

b) Assertion is true, but Reason is false

c) Both Assertion and Reason are true, and Reason explains Assertion

d) Both Assertion and Reason are true, but Reason does not explain Assertion

33 / 50

33. Read the data record below.

A oxidising-agent solution reacts with a reducing-agent solution. of the oxidising-agent solution is exactly equivalent to of the reducing-agent solution.

What is the normality of the reducing-agent solution?

34 / 50

34. In acidic medium, is reduced to . What is the -factor of in this reaction?

35 / 50

35. In a corrosion cell formed on an iron surface, an anodic region is the region where:

a) water molecules become electrons

b) ions are reduced to iron atoms

c) iron atoms are oxidised to iron ions

d) oxygen is always produced as a gas

36 / 50

36. In acidic medium, the half-reaction contains how many molecules on the product side after oxygen balancing?

37 / 50

37. A limiting-reagent redox calculation uses:

If of is mixed with of , the limiting reagent is:

a) , because it has the largest coefficient

b) ; is required

c) , because it has the smaller mole amount

d) neither reagent, because both are ions

38 / 50

38. A paired half-reaction set is written below:

What is the best overall interpretation?

a) is reduced and is oxidised

b) is oxidised and is reduced

c) both and are oxidised

d) both and are reduced

39 / 50

39. In , oxygen undergoes disproportionation. The oxidation-number changes of oxygen are:

a) and

b) and

c) and

d) and

40 / 50

40. Compare and . The oxidation number of sulphur is:

a) in both

b) in both

c) in and in

d) in and in

41 / 50

41. For , the oxidation-number graph would show:

a) both zinc and copper lines rising by units

b) both zinc and copper lines remaining horizontal

c) zinc line falling from to , copper line rising from to

d) zinc line rising from to , copper line falling from to

42 / 50

42. Use the arrangement described below.

A zinc strip in solution and a copper strip in solution are connected by a wire and a salt bridge. The cell reaction is .

The complete interpretation is:

a) zinc is cathode, copper is anode, and electrons flow from copper to zinc

b) zinc is reduced, copper ions are oxidised, and electrons flow through the salt bridge

c) zinc is anode, copper is cathode, and electrons flow from zinc to copper

d) both electrodes act as cathodes because both solutions contain ions

43 / 50

43. The coefficient before in affects:

a) the standard reduction potential, making it

b) the charge on each ion

c) the identity of

d) electron balance, not

44 / 50

44. Match the basic redox terms in Column I with their meanings in Column II.

Column I	Column II
P. Oxidised species	1. Species that undergoes oxidation
Q. Reduced species	2. Species that undergoes reduction
R. Oxidising agent	3. Substance that brings about oxidation of another substance
S. Reducing agent	4. Substance that brings about reduction of another substance

a) P-1, Q-2, R-3, S-4

b) P-4, Q-3, R-2, S-1

c) P-3, Q-4, R-1, S-2

d) P-2, Q-1, R-4, S-3

45 / 50

45. The reaction contains the following half-changes:

The reducing agent is:

46 / 50

46. A redox titration end point should be close to the equivalence point, where:

a) equal volumes of both solutions must have been mixed

b) all ions in the flask must become neutral atoms

c) reactants have met the redox stoichiometric ratio

d) both solutions must have the same molarity

47 / 50

47. Use the arrangement described below.

A clean zinc strip is dipped into blue solution. After some time, a reddish-brown deposit appears on the strip, and the blue colour fades.

Why does the older oxygen-hydrogen definition feel insufficient for this reaction?

a) The reaction has no visible observation

b) The change must be neutralisation because is a salt

c) The change is redox, not an old oxygen-hydrogen case

d) The reaction occurs only because water evaporates

48 / 50

48. In the half-reaction , the number of electrons lost is . The oxidation half-reaction is best written as:

49 / 50

49. The oxidation half of the reaction is:

50 / 50

50. In , a note calls the oxidising agent. The best correction is:

a) is the oxidising agent because it contains hydrogen

b) is the reducing agent; chloride is oxidised

c) no redox process occurs because water is formed

d) is the reducing agent because manganese is reduced

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Redox Reactions Mock Test – Class 11 Chemistry

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