Q. No.
Phosphine can not be produced by the following reaction:
1. White P is heated with NaOH.
2. Red P is heated with NaOH.
3. Ca3P2 is heated with water.
4. Phosphorus trioxide is boiled with water.
Which of the following statements regarding ozone is incorrect?
1. Powerful oxidising agent.
2. Bleaching agent
3. Paramagnetic
4. Bent shape
The gas that is used in the gas thermometer is:
| 1. | \(\mathrm{He} \) | 2. | \(\mathrm{O}_2 \) |
| 3. | \(\mathrm{Xe} \) | 4. | \(\mathrm{Ne}\) |
Which of the following statements is false?
| 1. | He is used in gas-cooled nuclear reactors |
| 2. | He is used as a cryogenic agent for carrying out experiments at low temperature |
| 3. | He is used to produce and sustain powerful superconducting magnets. |
| 4. | He is used to fill gas balloons instead of H 2 because it is lighter and non-inflammable. |
Which of the following liquids has the ability to climb the glass vessel's wall?
1. Alcohol
2. Liquid He
3. Liquid
4. Water
Which of the following statement is false?
| 1. | Liquid helium is used as a cryogenic liquid. |
| 2. | XeO3 has four σ and four π-bonds. |
| 3. | The hybridisation of Xe in XeF4 is sp3d2. |
| 4. | Among noble gases, the occurrence of argon is highest in air. |
The molecular shapes of SF4, CF4 and XeF4 are:
| 1. | The same with 2, 0 and 1 lone pairs of electrons on the central atoms, respectively |
| 2. | The same with 1, 1 and 1 lone pairs of electrons on the central atoms, respectively |
| 3. | Different with 0, 1 and 2 lone pairs of electrons on the central atoms, respectively |
| 4. | Different with 1, 0 and 2 lone pairs of electrons on the central atoms, respectively |
Argon is used:
1. To obtain low temperature
2. In high-temperature welding
3. In radiotherapy for the treatment of cancer
4. In filling airships
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