Q. No.Gadolinium (atomic number 64) is an element of the 4f series, Identify the correct electronic configuration of gadolinium from the following options:
\(1. (X e) 4 f^{7} 5 d^{1} 6 s^{2} \)
2. \( (X e) 4 f^{6} 5 d^{2} 6 s^{2}\)
3. \((X e) 4 f^{8} 6 d^{2}\)
4. \((X e) 4 f^{9} 5 s^{1}\)
\(1. (X e) 4 f^{7} 5 d^{1} 6 s^{2} \)
2. \( (X e) 4 f^{6} 5 d^{2} 6 s^{2}\)
3. \((X e) 4 f^{8} 6 d^{2}\)
4. \((X e) 4 f^{9} 5 s^{1}\)
Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which of the following is not the characteristic property of interstitial compounds?
| 1. | They have high melting points in comparison to pure metals |
| 2. | They are very hard |
| 3. | They are conductor. |
| 4. | They are chemically very reactive |
The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Determine the spin only magnetic moment value of ion:
| 1. | 2.87 BM | 2. | 3.87 BM |
| 3. | 3.47 BM | 4. | 3.57 BM |
KMnO4 acts as an oxidising agent in alkaline medium. When alkaline KMnO4 is treated with KI, iodide ion is oxidised to .........
| 1. | \( I_{2}\) | 2. | \( I O^{-}\) |
| 3. | \( I O_{3}^{-}\) | 4. | \(I O_{4}^{-}\) |
Which of the following statements is not correct?
| 1. | Copper liberates hydrogen from acids |
| 2. | In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine |
| 3. | are oxidising agents in an aqueous solution |
| 4. | are reducing agents in an aqueous solution |
When acidified the solution is added to Sn++ salt then Sn++ changes to
| 1. | Sn | 2. | Sn3+ |
| 3. | Sn4+ | 4. | Sn+ |
Why is the highest oxidation state of manganese in fluorides +4 (as in MnF4), while the highest oxidation state in oxides is +7 (as in Mn2O7)?
| 1. | Fluorine is more electronegative than oxygen |
| 2. | Fluorine does not possess d orbitals |
| 3. | Fluorine stabilises a lower oxidation state |
| 4. | In covalent compounds, fluorine can form a single bond only, while oxygen forms a double bond |
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 |
In the titration of KMnO₄ or its use as an oxidizing agent, the medium is acidified with dilute H₂SO₄ rather than HCl because:
| 1. | Both HCl and KMnO4 act as oxidising agents |
| 2. | KMnO4 oxidises HCl into Cl2, which is also an oxidising agent |
| 3. | KMnO4 is a weaker oxidising agent than HCl |
| 4. | KMnO4 acts as a reducing agent in the presence of HCl |
Match Column I (Catalyst) with Column II (Process), and mark the appropriate option:
| Column I - (Catalyst) | Column II - (Process) | ||
| A. | Ni in the presence of hydrogen | 1. | Contact process |
| B. | Cu2Cl2 | 2. | Vegetable oil to ghee |
| C. | V2O5 | 3. | Sandmeyer reaction |
| D. | Finely divided iron | 4. | Haber's process |
| 5. | Decomposition of KClO3 |
Codes:
| A | B | C | D | |
| 1. | 3 | 4 | 2 | 5 |
| 2. | 2 | 3 | 1 | 4 |
| 3. | 5 | 4 | 3 | 2 |
| 4. | 4 | 5 | 3 | 2 |
© 2026 GoodEd Technologies Pvt. Ltd.