TS EAMCET · Chemistry · Classification of Elements and Periodicity in Properties

In which of the following options, the elements are correctly arranged with respect to their negative electron gain enthalpies?

A \(\mathrm{P}>\mathrm{S}>\mathrm{Cl}>\mathrm{F}\)
B \(\mathrm{S}>\mathrm{P}>\mathrm{F}>\mathrm{Cl}\)
C \(\mathrm{Cl}>\mathrm{F}>\mathrm{S}>\mathrm{P}\)
D \(\mathrm{F}>\mathrm{Cl}>\mathrm{P}>\mathrm{S}\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(\mathrm{Cl}>\mathrm{F}>\mathrm{S}>\mathrm{P}\)

Step-by-step Solution

Detailed explanation

Among the given elements, \(\mathrm{Cl}\) has the highest negative electron gain enthalpy due to its size and electronegativity. Fluorine has smaller electron gain enthalpy than chlorine due to smaller size and very high electronegativity. Among S and P, S had a higher negative…

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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