Q. No.
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. |
Which of the following correctly describes SF₄, CF₄ and XeF₄ in terms of molecular shape and lone-pair number?
| 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 |
Which of the following is a common use of argon?
1. To obtain low temperature
2. In high-temperature welding
3. In radiotherapy for the treatment of cancer
4. In filling airships
What order does the stability of interhalogen compounds follow?
1. IF3 > BrF3 > CIF3
2. BrF3 > IF3 > ClF3
3. ClF3 > BrF3 > IF3
4. ClF3 > IF3 > BrF3
Which of the following Group 15 hydrides has the greatest tendency to form coordination complexes?
1. NH₃2. PH₃
3. BiH₃
4. SbH₃
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 gases can be used to provide a suitable atmosphere for welding magnesium?
1.
2. Ar
3.
4. All of the above
Which of the following gases is commonly used in a gas thermometer?
| 1. | \(\mathrm{He} \) | 2. | \(\mathrm{O}_2 \) |
| 3. | \(\mathrm{Xe} \) | 4. | \(\mathrm{Ne}\) |
Which of the following diseases has radon been used in the treatment of?
| 1. | Typhoid | 2. | Cancer |
| 3. | Cough and cold | 4. | Corona |
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