Noble gases

Helium is the second most abundant gas in the universe.

• a) True

• b) False

2. Which of the following noble gases do not occur in the elemental state in the atmosphere?

• a) Helium

• b) Neon

• c) Argon

• d) Radon

3. Which of the following is the second most abundant noble gas in the atmosphere?

• a) Helium

• b) Argon

• c) Neon

• d) Krypton

4. The main commercial source of helium is natural gas.

• a) True

• b) False

5. What are the decay products of radium?

• a) Radon and oxygen

• b) Radon and nitrogen

• c) Lanthanum and oxygen

• d) Radon and Helium

6. Which of the following statements is incorrect about noble gases?

• a) They are monoatomic

• b) They are colourless

• c) They are odourless

• d) They all have an outer electronic configuration of ns2np6

7. What is the boiling point of Helium?

• a) 7.8 K

• b) 0 K

• c) 4.2 K

• d) 3.7 K

8. Which of the following noble gases can diffuse through rubber?

• a) Helium

• b) Xenon

• c) Argon

• d) Krypton

What is the electron gain enthalpy for noble gases?

• a) > 0

• b) < 0

• c) = 0

• d) It is not defined for noble gases