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Question: Answered & Verified by Expert
Assertion (A) All noble gases are monoatomic.
Reason (R) All noble gases have very low melting and boiling points.
Chemistryp Block Elements (Group 15, 16, 17 & 18)AP EAMCETAP EAMCET 2022 (06 Jul Shift 2)
Options:
  • A Both $\mathrm{A}$ and $\mathrm{R}$ are correct and $\mathrm{R}$ is the correct explanation of $A$.
  • B Both $\mathrm{A}$ and $\mathrm{R}$ are correct but $\mathrm{R}$ is not the correct explanation of $A$.
  • C $\mathrm{A}$ is correct but $\mathrm{R}$ is incorrect.
  • D $\mathrm{A}$ is incorrect but $\mathrm{R}$ is correct.
Solution:
2362 Upvotes Verified Answer
The correct answer is: Both $\mathrm{A}$ and $\mathrm{R}$ are correct but $\mathrm{R}$ is not the correct explanation of $A$.
All noble gases have completely filled valence shell. So, they do not form bonds with any other atom and hence they are always monoatomic. Since, the noble gases have weak interatomic force, they have very low melting and boiling points. Hence, Both (A) and (R) are correct but (R) is not the correct explanation of (A).

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