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Q. No.Four statements for Cr and Mn are given below:
(I)
Cr2+ and Mn3+ have the same electronic configuration.
(II)
Cr2+ is a reducing agent while Mn3+ is an oxidizing agent.
(III)
Cr2+ is an oxidizing agent while Mn3+ is a reducing agent.
(IV)
Both Cr and Mn are oxidizing agents.
The correct statements are
1. (I), (III),(IV)
2. (I) , (II)
3. (I), (II) and (IV)
4. (I), (IV)
Subtopic: Chemistry of Mn and Cr Compounds |
71%
Level 2: 60%+
Hints
Match the following characteristics to the appropriate metal:
| Column I - Aspects | Column II - Metal | ||
| (a) | The metal which reveals the maximum number of oxidation states | (i) | Scandium |
| (b) | The metal although placed in 3d block is considered not as a transition element | (ii) | Copper |
| (c) | The metal which does not exhibit variable oxidation states | (iii) | Manganese |
| (d) | The metal which in +1 oxidation state in aqueous solution undergoes disproportionation | (iv) | Zinc |
Select the correct option :
| (a) | (b) | (c) | (d) | |
| 1. | (i) | (iv) | (ii) | (iii) |
| 2. | (iii) | (iv) | (i) | (ii) |
| 3. | (iii) | (i) | (iv) | (ii) |
| 4. | (ii) | (iv) | (i) | (iii) |
Subtopic: d-Block Elements- Properties & Uses |
88%
Level 1: 80%+
Hints
Match Compound/element in Column-I with uses in Column-II and select the best match from the codes given:
| Column-I (Compound/element) |
Column-II (Uses) |
||
| A. | Lanthanoid oxide | I. | Petroleum cracking |
| B. | Lanthanoid | II. | Television screen |
| C. | Mischmetal | III. | Lanthanoid metal + iron |
| D. | Mixed oxides of lanthanoids are employed | IV. | Production of iron alloy |
| Options: | A | B | C | D |
| 1. | II | I | IV | III |
| 2. | I | II | III | IV |
| 3. | II | IV | III | I |
| 4. | IV | I | III | II |
Subtopic: Lanthanoid & Actinoids Contraction |
56%
Level 3: 35%-60%
Hints
Match the properties given in Column I with uses given in Column II
| Column I-(Property) | Column II-(Metal) | ||
| A. | An element that can show +8 oxidation state | 1. | Mn |
| B. | 3d block element that can show up to +7 | 2. | Cr |
| C. | 3d block element with the highest melting point | 3. | Os |
| 4. | Fe | ||
| A | B | C | |
| 1. | 3 | 1 | 2 |
| 2. | 1 | 2 | 3 |
| 3. | 1 | 4 | 3 |
| 4. | 4 | 2 | 3 |
Subtopic: d-Block Elements- Properties & Uses |
93%
Level 1: 80%+
Hints
Match the statements given in Column I with the oxidation states given in Column and mark the correct option.
| Column I | Column II | ||
| A. | Oxidation state of Mn in \(\mathrm{MnO}_2\) is | 1. | +2 |
| B. | Most stable oxidation state of Mn is | 2. | +3 |
| C. | Most stable oxidation state of Mn in oxides is | 3. | +4 |
| D. | Characteristic oxidation state of lanthanoids is | 4. | +5 |
| 5. | +7 |
| Options: | A | B | C | D |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 3 | 1 | 5 | 2 |
| 3. | 5 | 4 | 3 | 2 |
| 4. | 4 | 5 | 3 | 2 |
Subtopic: Lanthanoid & Actinoids Contraction |
88%
Level 1: 80%+
Hints
Match the property given in Column-I with the element given in Column-II.
|
Column-I (Property) |
Column-II (Element) |
||
| A. |
Lanthanoid which shows + 4 oxidation state |
1. |
Pm |
| B. |
Radioactive lanthanoid |
2. |
Ce |
| C. |
Lanthanoid which has 4 electronic configurations in +3 oxidation state |
3. |
Lu |
| D. |
Lanthanoid which has 4 electronic configurations in +3 oxidation state |
4. |
Gd |
| Options: | A | B | C | D |
| 1. | 2 | 4 | 1 | 3 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 2 | 1 | 4 | 3 |
| 4. | 4 | 1 | 3 | 2 |
Subtopic: f-Block Elements- Properties & Uses |
81%
Level 1: 80%+
Hints
| Assertion (A): | \(Cu^{2+}\) iodide is not known. |
| Reason (R): | \(Cu^{2+}\) oxidises \(I^-\) to iodine. |
| 1. | Both (A) and (R) are True, and (R) is the correct explanation of the (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is not True but (R) is True. |
| 4. | Both (A) and (R) are False. |
Subtopic: d-Block Elements- Properties & Uses |
73%
Level 2: 60%+
Hints
Given below are two statements:
| Assertion (A): | Separation of Zr and Hf is difficult. |
| Reason (R): | Because Zr and Hf lie in the same group of the periodic table. |
| 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 not true but (R) is true |
| 4. | Both (A) and (R) are false. |
Subtopic: d-Block Elements- Properties & Uses |
67%
Level 2: 60%+
Hints
| Assertion (A): | Actinoids form relatively less stable complexes as compared to lanthanoids. |
| Reason (R): | Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding. |
| 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 not True but (R) is True. |
| 4. | Both (A) and (R) are False. |
Subtopic: Lanthanoid & Actinoids Contraction |
Level 4: Below 35%
Hints
Given below are two statements:
| Assertion (A): | Cu cannot liberate hydrogen from acids. |
| Reason (R): | Because it has positive electrode potential. |
| 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 not True but (R) is True |
| 4. | Both (A) and (R) are False. |
Subtopic: d-Block Elements- Properties & Uses |
89%
Level 1: 80%+
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