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 |
Match the properties given in Column I with the metals given in Column II:
Column I - (Property) | Column II - (Metal) | ||
A. | Element with highest second ionisation enthalpy | 1. | V |
B. | Element with highest third ionisation enthalpy | 2. | Cr |
C. | M in M(CO)6 is | 3. | Cu |
D. | Element with the highest heat of atomisation | 4. | Zn |
A | B | C | D | |
1. | 3 | 4 | 1 | 2 |
2. | 3 | 4 | 2 | 1 |
3. | 1 | 2 | 4 | 3 |
4. | 3 | 2 | 4 | 1 |
Which of the following statements is true?
1. | Cu(II)aq is more stable. |
2. | Cu(II)aq is less stable. |
3. | Cu(I) and Cu(II) are equally stable. |
4. | Stability of Cu(I) and Cu(II) depends on nature of copper salts. |
The metallic radii of some transition elements are given below. An element that has the highest density is:
Element | Fe | Co | Ni | Cu |
Metallic radii/pm | 126 | 125 | 125 | 128 |
1. Fe
2. Ni
3. Co
4. Cu
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. |
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. |
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 |
Among the following, which are amphoteric oxides?
1. V2O5, Cr2O3
2. Mn2O7, CrO3
3. CrO, V2O5
4. V2O5, V2O4
Which compound exhibits colour in its solid state?
1. Ag2SO4
2. CuF2
3. ZnF2
4. Cu2Cl2