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Q. No.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
Fe3O4 (s) + Al (s) → Fe (s) + Al2O3 (s)
Which of the following statements about the reaction are correct?
2. a, b
3. b, c
4. c, d
Subtopic: Oxidizing & Reducing Agents |
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Consider the following reaction:
2Na(s) + H2(g) → 2NaH(s)
The correct statement(s) in the balanced equation is(are):
a. Na is oxidized
b. H2 is oxidized
c. H2 is reduced
d. It is a disproportionation reaction
1. a, b
2. b, c
3. c, a
4. a, d
2Na(s) + H2(g) → 2NaH(s)
The correct statement(s) in the balanced equation is(are):
a. Na is oxidized
b. H2 is oxidized
c. H2 is reduced
d. It is a disproportionation reaction
1. a, b
2. b, c
3. c, a
4. a, d
Subtopic: Oxidizing & Reducing Agents |
79%
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Match the items in column I with column II.
(O.S = oxidation state)
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
(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 |
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Match the compounds in column I with the oxidation states of Cl in column II.
Options:
| Column I(Compound) | Column II(Oxidation state) |
| a. Cl2O7 | i. +4 |
| b. NaClO3 | ii. +1 |
| c. Cl2O | iii. +5 |
| d. ClO2 | iv. +7 |
| 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 |
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Assertion: The oxidation number of S in H2S2O8 is 6.
Reason: 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 statements are TRUE and Reason is the correct explanation of Assertion.
2. Both statements are TRUE but Reason is NOT the correct explanation of Assertion.
3. Assertion is TRUE and Reason is FALSE.
4. Assertion is FALSE and Reason is TRUE.
Reason: 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 statements are TRUE and Reason is the correct explanation of Assertion.
2. Both statements are TRUE but Reason is NOT the correct explanation of Assertion.
3. Assertion is TRUE and Reason is FALSE.
4. Assertion is FALSE and Reason is TRUE.
Subtopic: Introduction to Redox and Oxidation Number |
71%
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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%
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Assertion: In CrO5, the oxidation number of Cr is +6.
Reason: CrO5 has a butterfly structure in which peroxide bonds are present.
Reason: CrO5 has a butterfly structure in which peroxide bonds are present.
| 1. | Both statements are TRUE and Reason is the correct explanation of Assertion. |
| 2. | Both statements are TRUE but Reason is NOT the correct explanation of Assertion. |
| 3. | Assertion is TRUE and Reason is FALSE. |
| 4. | Assertion is FALSE and Reason is TRUE. |
Subtopic: Introduction to Redox and Oxidation Number |
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| 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%
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Assertion: Fluorine exists only in -1 oxidation state.
Reason: Fluorine has 2s22p5 configuration.
1. Both statements are TRUE and Reason is the correct explanation of Assertion.
2. Both statements are TRUE but Reason is NOT the correct explanation of Assertion.
3. Assertion is TRUE and Reason is FALSE.
4. Assertion is FALSE and Reason is TRUE.
Reason: Fluorine has 2s22p5 configuration.
1. Both statements are TRUE and Reason is the correct explanation of Assertion.
2. Both statements are TRUE but Reason is NOT the correct explanation of Assertion.
3. Assertion is TRUE and Reason is FALSE.
4. Assertion is FALSE and Reason is TRUE.
Subtopic: Introduction to Redox and Oxidation Number |
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Consider the given two statements:
| Assertion (A): | Amongst the halogens, fluorine can oxidize the elements to the highest oxidation state. |
| Reason (R): | Due to the small size of fluoride ions, it is difficult to oxidize fluoride ions to fluorine. Hence reverse reaction takes place more easily. |
| 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%
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