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Q. No.

Match the compounds in column I with the oxidation states of Cl in column II.
Column I(Compound) Column II(Oxidation state)
a. Cl2O7 i. +4
b. NaClO3 ii. +1
c. Cl2O iii. +5
d. ClO2 iv. +7
Options:
a b c d
1. iii iv ii i
2. ii iii iv i
3. iv iii ii i
4. iv i iii ii

Subtopic:  Introduction to Redox and Oxidation Number |
 90%
Level 1: 80%+
Hints
Match the items in column I with column II.
(O.S = oxidation state)
 
Column I Column II
a. Fe O.S in Fe2O3 i. +2
b. Mn O.S in MnO2 ii. +3
c. Mn O.S in MnO iii. +4

1. a=i; b=ii; c=iii
2. a=ii; b=iii; c=i
3. a=iii; b=ii; c=i
4. a=ii; b=i; c=iii
Subtopic:  Introduction to Redox and Oxidation Number |
 91%
Level 1: 80%+
Hints
Consider the following reaction:
2Na(s) + H2(g) → 2NaH(s)
The correct statements in the balanced equation are:
a. Na is oxidized
b. H2 is oxidized
c. H2 is reduced
d. It is a disproportionation reaction
Choose the correct option:
1. a and b 2. b and c
3. a and c 4. a and d
Subtopic:  Oxidizing & Reducing Agents |
 79%
Level 2: 60%+
Hints
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For the reaction:
Fe3O4 (s) + Al (s) → Fe (s) + Al2O3 (s)
Which of the following statements about the reaction are correct?

a. Stoichiometric coefficient of Fe is 9.
b. Aluminium is oxidized.
c. Ferrous ferric oxide (Fe3O4) is oxidized.
d. Aluminium is reduced.

1. a, c
2. a, b
3. b, c
4. c, d

Subtopic:  Oxidizing & Reducing Agents |
 84%
Level 1: 80%+
Hints
Assertion (A): The oxidation number of S in H2S2O8 is 6.
Reason (R): Maximum oxidation state of S is 6 because the maximum oxidation number of an element is equal to the number of valence electrons.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is NOT the correct explanation of (A).
3. (A) is True and (R) is False.
4. (A) is False and (R) is True.
Subtopic:  Introduction to Redox and Oxidation Number |
 71%
Level 2: 60%+
Hints
Given below are two statements: 
Assertion (A): MnO2 can act as an oxidizing agent as well as a reducing agent.
Reason (R): The oxidation state of Mn lies between the highest and lowest oxidation states.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Redox Titration & Type of Redox |
 92%
Level 1: 80%+
Hints
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Assertion (A): In CrO5, the oxidation number of Cr is +6.
Reason (R): CrO5 has a butterfly structure in which peroxide bonds are present.
 
1. Both (A) and (R) are True, and (R) is the correct explanation of (A).
2. Both (A) and (R) are True, but (R) is not the correct explanation of (A).
3. (A) is True, and (R) is False.
4. (R) is False, and (R) is true.
Subtopic:  Introduction to Redox and Oxidation Number |
 81%
Level 1: 80%+
Hints
Given below are two statements:
Statement I: l2 → IO-3 + I- is a disproportionation reaction.
Statement II: The oxidation number of Iodine can vary from -1 to +7.
 
1. Both (A) and (R) are True, and (R) correctly explains (A).
2. Both (A) and (R) are True, but (R) does not correctly explain (A).
3. (A) is True, but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Redox Titration & Type of Redox |
 61%
Level 2: 60%+
Hints
Assertion (A): Fluorine exists only in -1 oxidation state.
Reason (R): Fluorine has 2s22p5 configuration.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True and (R) is NOT the correct explanation of (A).
3. (A) is True and (R) is False.
4. (A) is False and (R) is True.
Subtopic:  Introduction to Redox and Oxidation Number |
 51%
Level 3: 35%-60%
Hints
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Consider the given two statements:
Assertion (A):

Fluorine has the ability to oxidize other elements to their highest oxidation states.
Reason (R): The fluoride ion is very difficult to oxidize back to fluorine because of its very small size and very high hydration enthalpy, making the reverse reaction less favorable.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  Oxidizing & Reducing Agents |
 68%
Level 2: 60%+
Hints
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