CUET · PHYSICS · PYQ PAPER 2025

\( E_{Ge}, E_{Si}, \) and \( E_{C} \) denote the ionization energy values for Ge, Si and C, respectively. The values correctly arranged in increasing order are:

A \( E_C, E_{Ge}, E_{Si} \)
B \( E_{Ge}, E_C, E_{Si} \)
C \( E_{Si}, E_{Ge}, E_C \)
D \( E_{Ge}, E_{Si}, E_C \)

Verified Solution

Answer & Solution

Correct Answer

(D) \( E_{Ge}, E_{Si}, E_C \)

Step-by-step Solution

Detailed explanation

Ionization energy generally increases as you move up a group in the periodic table because the atomic radius decreases, causing the nucleus to hold the outer electrons more tightly. Since Germanium (Ge), Silicon (Si), and Carbon (C) all belong to Group 14, and their positions…

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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