Uses of Krypton Xenon & Radon

Q.

What will happen when we run out of Helium?

Q.

12. Which of the following is an inert gas?

1. Argon

2. Hydrogen

3. Helium

4. Both (A) and (C)

Q. The noble gas which is not found in atmosphere:

1. $Ne$
2. $Ar$
3. $Rn$
4. $Kr$

Q. Which of the following scenarios are inappropriate uses of noble gases? Which of the following applications is inaccurate?

1. Helium and Argon are used to produce inert atmospheres for welding
2. Helium is suitable to fly air balloons and airships
3. Neon, Argon, Krypton and Xenon are used to impart different colours in “neon lights”
4. Liquid Helium can be used to cool apparatus close to 1 K. This is particularly impressive to cool superconducting magnets that produce very high magnetic fields
5. None of the above

Q. Which of the following scenarios are inappropriate uses of noble gases? Which of the following applications is inaccurate?

1. Helium and Argon are used to produce inert atmospheres for welding
2. Helium is suitable to fly air balloons and airships
3. Neon, Argon, Krypton and Xenon are used to impart different colours in “neon lights”
4. Liquid Helium can be used to cool apparatus close to 1 K. This is particularly impressive to cool superconducting magnets that produce very high magnetic fields
5. None of the above

Q.

Transition metals are good electrical conductor because ___________.

1. they are metals
2. they are solids
3. they have free electrons in outer energy levels
4. they are hard

Q. Helium is obtained from which of the following?

1. Natural gases trapped under rock formations.
2. Liquid air
3. Gasoline
4. Radoactive decay