- 1(current)
Q. No.What is the reason behind the color of KMnO4?
1. d-d transition
2. Charge transfer spectra
3. Both (1) and (2)
4. Polarisation of anion
1. d-d transition
2. Charge transfer spectra
3. Both (1) and (2)
4. Polarisation of anion
Subtopic: Chemistry of Mn and Cr Compounds |
Level 3: 35%-60%
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The ratio of the number of electrons gained by acidified KMnO4 and acidified K2Cr2O7, respectively, in the given reaction is:
KMnO4 \( \xrightarrow[]{H^{+}}\) Mn2+
K2Cr2O7 \( \xrightarrow[]{H^{+}}\) Cr3+
KMnO4 \( \xrightarrow[]{H^{+}}\) Mn2+
K2Cr2O7 \( \xrightarrow[]{H^{+}}\) Cr3+
| 1. | 5:6 | 2. | 6:5 |
| 3. | 3:5 | 4. | 5:3 |
Subtopic: Chemistry of Mn and Cr Compounds |
Level 3: 35%-60%
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Subtopic: Chemistry of Mn and Cr Compounds |
Level 3: 35%-60%
Hints
Links
Which one of the following statements about unit is correct?
| 1. | unit has one peroxy linkage. |
| 2. | has two tetrahedral units joined through Cr—O— Cr. |
| 3. | The Cr — O — Cr bond angle is equal to 109°28′. |
| 4. | All of the above. |
Subtopic: Chemistry of Mn and Cr Compounds |
Level 3: 35%-60%
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Hints
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Given below are two statements:
| Assertion (A): | Colour of KMnO4 became light pink when oxalic acid is added to its solution in an acidic medium. |
| Reason (R): | KMnO4 is a strong oxidising agent. |
| 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: Chemistry of Mn and Cr Compounds |
Level 3: 35%-60%
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Hints
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Given below are two statements:
| Statement I: |
Iodide ions (I⁻) can be independently oxidized to iodine (I₂) by iron(III) catalyst, acidified K₂Cr₂O₇, and neutral KMnO₄ |
| Statement II: | The manganate ion (MnO₄²⁻) is paramagnetic in nature and involves pπ – pπ bonding. |
| 1. | Both Statement I and Statement II are True |
| 2. | Both Statement I and Statement II are False |
| 3. | Statement I is True, but Statement II is False |
| 4. | Statement I is False, but Statement II is True |
Subtopic: Chemistry of Mn and Cr Compounds |
Level 4: Below 35%
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When acidified \(KMnO_4 \) reacts with oxalic acid gives a manganese product. Find the magnetic moment (spin only) of \(Mn\) in this product:
1. 2
2. 6
3. 0
4. 4
1. 2
2. 6
3. 0
4. 4
Subtopic: Chemistry of Mn and Cr Compounds |
70%
Level 2: 60%+
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- 1(current)
Q. No.
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