- 1(current)
Q. No.Which of the following factors is primarily responsible for the smaller atomic radius of
gallium compared to aluminium?
1. Poor shielding effect of the 2d electrons
2. Poor shielding effect of the 3d electrons
3. Poor shielding effect of the 3p electrons
4. Poor shielding effect of the 2s electrons
When hydrated alumina is treated with an aqueous NaOH solution, it gives-
1.
2.
3.
4. Both (2) and (3)
Which of the following statements is incorrect?
| 1. | Conc. HNO3 can be transported in an aluminium container. |
| 2. | Diamond is used as an abrasive. |
| 3. | A mixture of dilute NaOH and aluminium pieces is used to declog the drain. |
| 4. | Graphite can't be used as a lubricant. |
Aluminum trifluoride is insoluble in anhydrous HF but dissolves on addition of NaF because:
| 1. | Hydrogen fluoride (HF) is a covalent compound and has very strong intermolecular hydrogen bonding. |
| 2. | Sodium fluoride (NaF) is an ionic compound and free F- is available. |
| 3. | Both (1) and (2) |
| 4. | None of the above. |
Identify the complex obtained from the reaction of sodium hexafluoroaluminate(III) with boron trifluoride.
1.
2.
3.
4. None of the above
Which of the following statements is incorrect?
| 1. | Tl (+1) is more stable than Tl (+3). |
| 2. | For group 13, the stability of the +3 oxidation state decreases down the group. |
| 3. | Ge, Sn, and Pb show both the +2 and + 4 states. |
| 4. | None of the above. |
- 1(current)
Q. No.
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