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
Current round: 1^st
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Quiz: Redox Reactions – Certificate Challenge
Total questions: 480
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1 / 50

1. The electron-flow direction in a simple redox reaction is best stated as:

a) from reduced product to oxidised product only

b) from reducing agent to oxidising agent

c) from oxidising agent to reducing agent

d) from the substance with more atoms to the substance with fewer atoms

2 / 50

2. A comparison of cold dilute alkali and hot concentrated alkali reactions of chlorine shows different products. The redox reason is that:

a) undergoes the disproportionation change

b) chloride ions are always oxidised to

c) chlorine can reach different positive oxidation states

d) chlorine keeps oxidation number in every product

3 / 50

3. A student multiplies by and by , then says no coefficient issue exists. The better principle is:

a) potentials are balanced by changing ionic charges

b) electrode potentials must always be multiplied by the largest coefficient

c) coefficients are unnecessary in all redox equations

d) potentials are not multiplied, but electron counts must still balance

4 / 50

4. A acidified solution reacts with according to . If of is used, the moles of that reacted are:

5 / 50

5. A table gives two possible cells.

Cell
P
Q

Which decision is correct?

a) P has , while Q has

b) P has , while Q has

c) both P and Q have

d) P has , while Q has

6 / 50

6. Assertion: Every reaction that produces a gas is a redox reaction.
Reason: A redox reaction is identified by oxidation-number change, not by gas formation alone.

a) Assertion is true, but Reason is false

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

c) Assertion is false, but Reason is true

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

7 / 50

7. A disinfecting or bleaching action by chlorine water is redox-related because chlorine-containing species can:

a) force every atom in the solution to oxidation number

b) act only as neutral spectators

c) remove colour without chemical change

d) oxidise coloured or harmful substances

8 / 50

8. In , oxygen is . Which interpretation is most suitable for the oxidation number of lead?

a) Lead must be on every atom because there are four oxygen atoms

b) Lead must be on every atom because there are three lead atoms

c) Lead has average , consistent with mixed lead states

d) Lead has oxidation number because the compound is neutral

9 / 50

9. In the cell, the zinc electrode gradually loses mass because:

a) zinc atoms enter solution as

b) ions plate out as zinc metal

c) electrons add mass to the zinc electrode

d) sulphate ions become zinc atoms

10 / 50

10. The balanced acidic half-reaction for dichromate reduction is:

11 / 50

11. The reaction contains the following half-changes:

The reducing agent is:

12 / 50

12. A positive for a proposed galvanic cell generally indicates that:

a) a standard-state spontaneous reaction

b) both electrodes are cathodes

c) electrons flow through the salt bridge only

d) the reaction must be non-redox

13 / 50

13. A claim says, “The -factor of is always .” The best correction is:

a) -factor is always equal to the ionic charge of

b) -factor is not used in redox calculations

c) -factor is always equal to the number of oxygen atoms

d) -factor depends on the reduction product and medium

14 / 50

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

15 / 50

15. Using the same table, the strongest reducing agent among , , and is:

16 / 50

16. A learner balances and says the total decrease in iron is only . The correction is:

a) the total decrease is , because oxygen is present

b) the total decrease is , because iron becomes elemental

c) the total decrease is , because contains two iron atoms

d) the total decrease is , because contains three oxygen atoms

17 / 50

17. In , the total number of electrons lost by aluminium atoms is:

18 / 50

18. The oxidation number of calcium in is best assigned as:

19 / 50

19. A cell has and . What is ?

20 / 50

20. In acidic medium, nitrate is reduced to . The balanced reduction half-reaction is:

21 / 50

21. If the salt bridge is removed from a working galvanic cell, the cell stops working mainly because:

a) half-cell charge balance can no longer be maintained

b) electrons can no longer move through the metal wire

c) copper ions instantly become spectator ions

d) zinc can no longer lose electrons at its surface

22 / 50

22. Sulphur dioxide reduces dichromate ion in acidic medium according to:

After redox balancing, the coefficient of is:

23 / 50

23. For in acidic medium, the -factor of is:

24 / 50

24. The oxidation-number method begins by:

a) adding to every reaction immediately

b) removing all oxygen atoms from the equation

c) assigning oxidation numbers on both sides

d) changing formulas until charges match

25 / 50

25. A reaction changes into . The oxidation-number interpretation is:

a) oxidation, because becomes a metal

b) reduction; copper falls from to

c) no redox change, because copper is present on both sides

d) oxidation, because the charge disappears

26 / 50

26. The row that applies the oxygen exception correctly is:

Row	Species	Oxygen oxidation number	Reason
P			peroxide
Q			peroxide
R			ordinary oxide
S			ordinary oxide

a) Row S

b) Row P

c) Row Q

d) Row R

27 / 50

27. In the reaction , the reducing agent is:

28 / 50

28. The formula for standard cell potential of a galvanic cell is:

d) for all cells

29 / 50

29. In neutral or mildly basic medium, is reduced to . The -factor of in this case is:

30 / 50

30. In , the oxidation-number changes are:

a) ,

b) ,

c) ,

d) ,

31 / 50

31. A reaction has changing to and changing to . Before balancing oxygen and hydrogen, what must be noticed?

a) both chromium and iron are oxidised

b) neither chromium nor iron changes oxidation number

c) chromium is reduced and iron is oxidised

d) chromium is oxidised and iron is reduced

32 / 50

32. A coated iron sheet is scratched in a moist environment. In Case 1 the coating is zinc, and in Case 2 the coating is tin. Zinc is more readily oxidised than iron, while tin is less readily oxidised than iron. The better redox-based protection after scratching is:

a) zinc coating, because zinc can oxidise sacrificially

b) both coatings, because scratching prevents all corrosion

c) neither coating, because metals cannot form galvanic pairs

d) tin coating, because tin always oxidises before iron

33 / 50

33. A table lists possible reduction products of .

Medium	Reduction product	-factor of
P. Acidic
Q. Neutral or mildly basic
R. Strongly basic
S. Acidic

Which row needs correction?

a) Row R

b) Row Q

c) Row P

d) Row S

34 / 50

34. 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?

35 / 50

35. A calculation for is written as , giving . The mistake is that:

a) oxygen should be in all oxoanions

b) the ion charge was not used in the sum

c) manganese must always have oxidation number

d) the subscript should not multiply oxygen

36 / 50

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

a) Colour change and gas evolution occurring together

b) Heating and cooling occurring at equal rates

c) Oxidation and reduction occurring together

d) Dissolving and crystallisation occurring in the same vessel

37 / 50

37. A thiosulphate solution is used to titrate iodine. If of thiosulphate is used, the moles of iodine present are:

38 / 50

38. Photosynthesis may be described broadly as a redox process because:

a) water is always unchanged in every step

b) carbon dioxide is reduced into carbohydrate-like material

c) no oxidation-number change is involved in the overall process

d) carbon dioxide is converted into elemental carbon only

39 / 50

39. A formula list gives , , , and . The sequence of oxidation numbers is:

40 / 50

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

a) oxidation because the oxidation number decreases from to

b) reduction because the oxidation number increases from to

c) oxidation because the oxidation number increases from to

d) no redox change because iron remains iron

41 / 50

41. Comproportionation is best described as:

a) a metal dissolving in acid without any electron transfer

b) two oxidation states of one element form an intermediate state

c) two salts exchanging ions without oxidation-number change

d) one element in one oxidation state forming two products with higher and lower oxidation states

42 / 50

42. A reaction occurs when an iron nail is dipped in copper sulphate solution:

The reducing agent is:

43 / 50

43. In the reaction , the reducing agent is:

d) inside

44 / 50

44. The oxidation number of chlorine changes across , , and as:

45 / 50

45. Rusting of iron is classified as corrosion because:

a) iron undergoes slow oxidation

b) oxygen is always oxidised from to

c) iron changes into a noble gas

d) iron remains at oxidation number throughout

46 / 50

46. 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

47 / 50

47. The reaction is a redox combination reaction because:

a) sodium is reduced and chlorine is oxidised while one product forms

b) sodium and chlorine both remain at oxidation number

c) no electron transfer is possible in a solid salt

d) sodium is oxidised and chlorine is reduced while one product forms

48 / 50

48. Read the observation note.

A strip of is placed in solution. A grey metallic coating appears on the copper strip, and the solution gradually becomes blue. The simplified ionic change is .

The blue colour appears mainly because:

a) ions are oxidised to

b) nitrate ions are reduced to nitrogen gas

c) atoms form in solution

d) copper metal dissolves as neutral atoms

49 / 50

49. The standard hydrogen electrode involves the half-reaction:

50 / 50

50. The pair in which both oxidation numbers are assigned correctly is:

a) ;

b) ;

c) in elemental sodium ;

d) ;

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Redox Reactions Mock Test – Class 11 Chemistry

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