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Q. No.Which of the following ions displays the d-d transition and paramagnetism?
1.
\(\mathrm{CrO}_4^{2-} \)
2.
\(\mathrm{Cr}_2 \mathrm{O}_7^{2-} \)
3.
\(\mathrm{MnO}_4^{-} \)
4.
\(\mathrm{MnO}_4^{2-}\)
| 1. | \(\mathrm{CrO}_4^{2-} \) | 2. | \(\mathrm{Cr}_2 \mathrm{O}_7^{2-} \) |
| 3. | \(\mathrm{MnO}_4^{-} \) | 4. | \(\mathrm{MnO}_4^{2-}\) |
Subtopic: d-Block Elements- Properties & Uses |
65%
Level 2: 60%+
NEET - 2018
Hints
Match Column-I with Column-II and mark the most appropriate option:
| Column-I (Metal ion) |
Column-II (Spin magnetic moment) |
||
| A. | Co3+ | i. | √8 B.M. |
| B. | Cr3+ | ii. | √35 B.M. |
| C. | Fe3+ | iii. | √15 B.M. |
| D. | Ni2+ | iv. | √24 B.M. |
| A | B | C | D | |
| 1. | iv | iii | ii | i |
| 2. | i | ii | iii | iv |
| 3. | iv | i | ii | iii |
| 4. | iii | iv | i | ii |
Subtopic: d-Block Elements- Properties & Uses |
77%
Level 2: 60%+
NEET - 2018
Hints
The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64), and Tb (Atomic no. 65) are, respectively:
| 1. | [Xe] 4f6 5d1 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
|
| 2. | [Xe] 4f6 5d1 6s2, [Xe] 4f75d1 6s2, and [Xe]4f8 5d1 6s2
|
| 3. | [Xe] 4f7 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
|
| 4. | [Xe] 4f7 6s2, (Xe]4f8 6s2, and [Xe]4f8 5d1 6s2 |
Subtopic: f-Block Elements- Properties & Uses |
70%
Level 2: 60%+
NEET - 2016
Hints
Which of the following statements is false?
| 1. | On passing H2S through acidified K2Cr2O7 solution, a milky colour is observed. |
| 2. | Na2Cr2O7 is preferred over K2Cr2O7 in volumetric analysis. |
| 3. | K2Cr2O7 solution in an acidic medium is orange. |
| 4. | K2Cr2O7 solution becomes yellow in increasing the pH beyond 7 |
Subtopic: d-Block Elements- Properties & Uses |
71%
Level 2: 60%+
AIPMT - 2012
Hints
Zinc can be coated on iron to produce galvanised iron, but the reverse is not possible because:
| 1. | Zinc is lighter than iron. |
| 2. | Zinc has a lower melting point than iron. |
| 3. | Zinc has a lower negative reduction potential than iron. |
| 4. | Zinc has a higher negative reduction potential than iron. |
Subtopic: d-Block Elements- Properties & Uses |
61%
Level 2: 60%+
NEET - 2016
Hints
Subtopic: d-Block Elements- Properties & Uses | Chemistry of Mn and Cr Compounds |
73%
Level 2: 60%+
NEET - 2017
Hints
Subtopic: Chemistry of Mn and Cr Compounds |
56%
Level 3: 35%-60%
Hints
The native silver metal forms a water-soluble complex with a dilute aqueous solution of NaCN in the presence of :
1. Nitrogen
2. Oxygen
3. Carbon dioxide
4. Argon
Subtopic: d-Block Elements- Properties & Uses |
52%
Level 3: 35%-60%
Hints
The incorrect statement among the following regarding Cerium is :
| 1. | The +4 oxidation state of cerium is not known in solutions. |
| 2. | The +3 oxidation state of cerium is more stable than the +4 oxidation state. |
| 3. | The common oxidation states of cerium are +3, and +4. |
| 4. | Cerium (IV) acts as an oxidizing agent. |
Subtopic: Lanthanoid & Actinoids Contraction |
66%
Level 2: 60%+
Hints
The ionization potential values of d-block elements as compared to the ionization potential values of f-block elements are:
| 1. | Higher | 2. | Equal |
| 3. | Lower | 4. | Can't compare. |
Subtopic: d-Block Elements- Properties & Uses |
69%
Level 2: 60%+
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