Important Questions Of P Block Class 12 (Group 18 Elements) are very important for NEET, JEE as well as AIIMS exam. These P Block Elements Class 12 Important Questions will help you to score more marks. These Important Questions Of P Block Class 12 (Group 18 Elements) will be very useful for those students who are preparing with complete devotion and hard work.
Important Questions Of P Block Class 12 (Group 18 Elements)
1. Which of the following scientists first discovered helium in the solar spectrum during a total solar eclipse?
a) Lord Rayleigh
b) J N Lockyer
c) William Ramsay
d) Antoine Lavoisier
Answer: J N Lockyer
2. What is the half-life of radon?
a) 10 days
b) 4.56 days
c) 3.82 days
d) 5.46 days
Answer: 3.82 days
3. What are the decay products of radium?
a) Radon and oxygen
b) Radon and nitrogen
c) Lanthanum and oxygen
d) Radon and Helium
Answer: Radon and Helium
4. Which of the following noble gases is not obtained via fractional distillation?
a) Krypton
b) Argon
c) Neon
d) Helium
Answer: Helium
5. 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
Answer: They all have an outer electronic configuration of ns2np6
6. What is the ratio of the molar heat at constant pressure to the molar heat at constant volume for a noble gas?
a) 1.5
b) 1.67
c) 1.73
d) 1.37
Answer: 1.67
7. What is the electron gain enthalpy for noble gases?
a) > 0
b) < 0
c) = 0
d) It is not defined for noble gases
Answer: > 0
8. What is the boiling point of Helium?
a) 7.8 K
b) 0 K
c) 4.2 K
d) 3.7 K
Answer: 4.2 K
9. Which of the following noble gases is most soluble in water?
a) Helium
b) Radon
c) Krypton
d) Neon
Answer: Radon
10. Which of the following noble gases can diffuse through rubber?
a) Helium
b) Xenon
c) Argon
d) Krypton
Answer: Helium
11. Which among the following noble gases does not form clathrates?
a) Argon
b) Xenon
c) Krypton
d) Helium
Answer: Helium
12. The main commercial source of helium is natural gas.
a) True
b) False
Answer: True
13. Helium is the second most abundant gas in the universe.
a) True
b) False
Answer: True
14. Which of the following noble gases do not occur in the elemental state in the atmosphere?
a) Helium
b) Neon
c) Argon
d) Radon
Answer: Radon
15. Which of the following is the second most abundant noble gas in the atmosphere?
a) Helium
b) Argon
c) Neon
d) Krypton
Answer: Neon
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