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Q. No.Identify the incorrect statement from the following:
1.
Zirconium and Hafnium have identical radii of 160 pm and 159 pm, respectively as a consequence of lanthanoid contraction.
2.
Lanthanoids reveal only +3 oxidation state.
3.
The lanthanoid ions other than the f0 type and the f14 type are all paramagnetic.
4.
The overall decrease in atomic and ionic radii from lanthanum to lutetium is called lanthanoid contraction.
Subtopic: Lanthanoid & Actinoids Contraction |
70%
Level 2: 60%+
NEET - 2020
Hints
Match the following aspects with the respective metal:
| Aspects | Metal | ||
| (a) | The metal that reveals the maximum number of oxidation states | (i) | Scandium |
| (b) | The metal, although placed in a 3d block, is not considered a transition element | (ii) | Copper |
| (c) | The metal that does not exhibit variable oxidation states | (iii) | Manganese |
| (d) | The metal, which is in +1 oxidation state in aqueous solution, undergoes disproportionation | (iv) | Zinc |
Select the correct option:
| Options: | (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 |
86%
Level 1: 80%+
NEET - 2020
Hints
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of:
| 1. | Lanthanoid contraction |
| 2. | Having similar chemical properties |
| 3. | Belonging to the same group |
| 4. | Diagonal relationship |
Subtopic: Lanthanoid & Actinoids Contraction |
89%
Level 1: 80%+
NEET - 2021
Hints
The incorrect statement among the following is:
| 1. | Lanthanoids are good conductors of heat and electricity. |
| 2. | Actinoids are highly reactive metals, especially when finely divided. |
| 3. | Actinoid contraction is greater for element to element than Lanthanoid contraction. |
| 4. | Most of the trivalent Lanthanoid ions are colourless in the solid-state. |
Subtopic: f-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |
61%
Level 2: 60%+
NEET - 2021
Hints
Urea reacts with water to form A which will decompose to form B. B when passed through \(\left(Cu\right)^{2 +}\) (aq), deep blue colour solution C is formed. What is the formula of C from the following?
| 1. | \(\left[Cu \left(NH_{3}\right)_{4}\right]^{2 +}\) | 2. | \(Cu \left(\right. OH \left.\right)_{2}\) |
| 3. | \(CuCO_{3} . Cu (OH)_{2}\) | 4. | \(CuSO_{4}\) |
Subtopic: d-Block Elements- Properties & Uses |
68%
Level 2: 60%+
NEET - 2020
Hints
Identify the incorrect statement.
| 1. | The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes. |
| 2. | Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals. |
| 3. | The oxidation states of chromium in CrO42– and Cr2O72– are not the same. |
| 4. | Cr2+(d4) is a stronger reducing agent than Fe2+(d6) in water. |
Subtopic: d-Block Elements- Properties & Uses |
78%
Level 2: 60%+
NEET - 2020
Hints
The calculated spin only magnetic moment of Cr2+ ion is:
1. 4.90 BM
2. 5.92 BM
3. 2.84 BM
4. 3.87 BM
Subtopic: d-Block Elements- Properties & Uses |
79%
Level 2: 60%+
NEET - 2020
Hints
Gadolinium has a low value of third ionisation enthalpy because of:
| 1. | High basic character | 2. | Small size |
| 3. | High exchange enthalpy | 4. | High electronegativity |
Subtopic: f-Block Elements- Properties & Uses |
70%
Level 2: 60%+
NEET - 2022
Hints
Identify the incorrect statement from the following:
| 1. | The shapes of dxy, dyz, and dzx orbitals are similar to each other; and dx2 -y2 and dz2 are similar to each other. |
| 2. | All the five 5d orbitals are different in size when compared to the respective 4d orbitals. |
| 3. | All the five 4d orbitals have shapes similar to the respective 3d orbitals. |
| 4. | In an atom, all the five 3d orbitals are equal in energy in free state. |
Subtopic: d-Block Elements- Properties & Uses |
57%
Level 3: 35%-60%
NEET - 2022
Hints
In the neutral or faintly alkaline medium, \(KMnO_4 \) oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from:
| 1. | +6 to +5 | 2. | +7 to +4 |
| 3. | +6 to +4 | 4. | +7 to +3 |
Subtopic: d-Block Elements- Properties & Uses |
74%
Level 2: 60%+
NEET - 2022
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