CUET · CHEMISTRY · PYQ PAPER 2023

Ultra pure silicon can be obtained by

A Distillation
B Electrolytic refining
C Vapour phase refining
D Zone refining

Verified Solution

Answer & Solution

Correct Answer

(D) Zone refining

Step-by-step Solution

Detailed explanation

Zone refining

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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From CUET

Match List I with List II

LIST I	LIST II
A. Range of \(\operatorname{cosec}^{-1} x\)	I. \((0, \pi)\)
B. Range of \(\tan ^{-1} x\)	II. \([0, \pi]-\left\{\frac{\pi}{2}\right\}\)
C. Range of \(\sec ^{-1} x\)	III. \(\left[-\frac{\pi}{2}, \frac{\pi}{2}\right]-\{0\}\)
D. Range of \(\cot ^{-1} x\)	IV. \(\left(-\frac{\pi}{2}, \frac{\pi}{2}\right)\)

CUET 2023 Medium

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