Q. No.
An example of the effect of the concentration of nitric acid on the formation of oxidation products would be:
1. 3Cu + 8HNO3(conc.) → 3Cu(NO3)2 + 2NO + 4H2O
2. Cu + 4HNO3 (conc.) → Cu(NO3)2 + 2NO2 + 2H2O
3. Both (1), and (2)
4. None of the above
Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d5: Atomic number for the element X is :
1. 25
2. 26
3. 27
4. 24
Among the following, which are amphoteric oxides?
1. V2O5, Cr2O3
2. Mn2O7, CrO3
3. CrO, V2O5
4. V2O5, V2O4
The correct value of the spin-only magnetic moment of ion is equal to:
| 1. | 2.87 BM | 2. | 3.87 BM |
| 3. | 3.47 BM | 4. | 3.57 BM |
Which of the following statements is false?
| 1. | Copper liberates hydrogen from acids. |
| 2. | In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine. |
| 3. | Mn3+, and Co3+ are oxidizing agents in an aqueous solution. |
| 4. | Ti2+, and Cr2+ are reducing agents in an aqueous solution. |
Highest oxidation state of manganese in fluoride is +4 (Mn) but the highest oxidation state in oxides is +7 (Mn2O7). The reason is :
| 1. | Fluorine is more electronegative than oxygen. |
| 2. | Fluorine does not possess d orbitals. |
| 3. | Fluorine stabilizes lower oxidation state of Mn. |
| 4. | In covalent compounds, fluorine can only form a single bond while oxygen forms a double bond. |
HCl is not used to make the medium acidic in oxidation reaction of , 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. | KMnO 4 acts as a reducing agent in the presence of HCl. |
Which of the following compounds cannot act as an oxidising agent?
| 1. | \(\mathrm{CrO}_3 \) | 2. | \(\mathrm{CrO}_4^{2-} \) |
| 3. | \(\mathrm{WO}_3\) | 4. | Both 1 and 2 |
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