Q. No. acts as an oxidizing agent in an acidic medium. The number of moles of that will be needed to react with one mole of sulphide ions in an acidic solution is
1.
\(\dfrac{2}{5}\)
2.
\(\dfrac{3}{5}\)
3.
\(\dfrac{4}{5}\)
4.
\(\dfrac{1}{5}\)
Which of the following is amphoteric oxide ?
| 1. | \(V_{2} O_{5} , C r_{2} O_{3}\) | 2. | \(M n_{2} O_{7} , C r O_{3}\) |
| 3. | \(C r O , V_{2} O_{5}\) | 4. | \(V_{2} O_{5} , V_{2} O_{4}\) |
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. \((X e) 4 f^{9} 5 s^{1}\)
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 |
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