TS EAMCET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Assertion (A) The boiling points of noble gases increases from He to Xe. Reason (R) The interatomic van der Waals' attractive forces increases from \(\mathrm{He}\) to \(\mathrm{Xe}\). The correct answer is

A Both (A) and (R) are true, and (R) is the correct explanation of (A)
B Both \((\mathrm{A})\) and \((\mathrm{R})\) are true, and \((\mathrm{R})\) is not the correct explanation of (A)
C (A) is true but (R) is not true
D (A) is not true but (R) is true

Verified Solution

Answer & Solution

Correct Answer

(A) Both (A) and (R) are true, and (R) is the correct explanation of (A)

Step-by-step Solution

Detailed explanation

As the size of noble gases increases from He to Xe, van der Waals' forces increases and due to which boiling point increases.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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