Q. No.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. |
Scandium (Z = 21) is a transition element but zinc (Z = 30) is not because-
1. Sc has 3d0 and Zn has 3d10
2. Sc has 3d1 and Zn has 3d10
3. Sc has 3d10 and Zn has 3d1
4. None of the above
| Statement I: | Silver atom has completely filled d orbitals (4d10) in its ground state. |
| Statement II: | Silver is not a transition element. |
| 1. | Statement I is True , Statement II is False. |
| 2. | Statement I is False, Statement II is True. |
| 3. | Both Statement I and Statement II are True. |
| 4. | Both Statement I and Statement II are False. |
The correct statement regarding the element silver(Ag) is:
| 1. | It is a hard metal. |
| 2. | It is not a transition element. |
| 3. | It has a partially filled d orbital in a +2 oxidation state. Thus, it is a transition element. |
| 4. | None of the above |
Match the properties given in Column I with the metals given in Column II and mark the appropriate answer.
| Column I (Property) | Column II (Metal) | ||
| A. | Element with highest second ionisation enthalpy | i. | Co |
| B. | Element with highest third ionisation enthalpy | ii. | Cr |
| C. | M in \(\mathrm{M}(\mathrm{CO})_6\) is | iii. | Cu |
| D. | Element with highest heat of atomisation | iv. | Zn |
| v. | Ni |
Electronic configuration of a transition element X in +3 oxidation state is [Ar]. What is its atomic number?
| 1. | 25 | 2. | 26 |
| 3. | 27 | 4. | 24 |
Although zirconium belongs to 4d transition series and hafnium to 5d transition series even then they show similar physical and chemical properties because............. .
| 1. | Both belong to d-block |
| 2. | Both have same number of electrons |
| 3. | Both have similar atomic radius |
| 4. | Both belong to the same group of the Periodic Table |
Metallic radii of some transition elements are given below. Which of these elements will have highest density?
|
Element |
Fe |
Co |
Ni |
Cu |
|
Metallic radii/pm |
126 |
125 |
125 |
128 |
| 1. | Fe | 2. | Ni |
| 3. | Co | 4. | Cu |
The electronic configuration of Cu(II) is whereas that of Cu(I) is , the correct statement about the aqueous solution of Cu(II) and Cu(I) among the following is:
| 1. | Cu(II) is more stable |
| 2. | Cu(II) is less stable |
| 3. | Cu(I) and Cu(II) are equally stable |
| 4. | Stability of Cu(I) and Cu(II) depends on the nature of copper salts |
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 |
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