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

Choose the correct order of second ionisation enthalpies Carbon, Nitrogen, Oxygen and Fluorine.

A Carbon $>$ Nitrogen $>$ Oxygen $>$ Fluorine
B Oxygen $>$ Carbon $>$ Nitrogen $>$ Fluorine
C Fluorine $>$ Nitrogen $>$ Carbon $>$ Oxygen
D Oxygen $>$ Fluorine $>$ Nitrogen $>$ Carbon

Verified Solution

Answer & Solution

Correct Answer

(D) Oxygen $>$ Fluorine $>$ Nitrogen $>$ Carbon

Step-by-step Solution

Detailed explanation

The corresponding electronic configurations for the given species are: $\mathrm{C}: 1 \mathrm{~s}^2 2 \mathrm{~s}^2 2 \mathrm{p}^2, \mathrm{~N}: 1 \mathrm{~s}^2 2 \mathrm{~s}^2 2 \mathrm{p}^3, \mathrm{O}: 1 \mathrm{~s}^2 2 \mathrm{~s}^2 2 \mathrm{p}^4$ F :…

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.

Same subject

Match the following.

	Column-1 Reaction		Column-2 Main product
A	${SO}_{3} \overset{heavy water}{⟶}$	I	$C_{2} D_{2}$
B	${CaC}_{2} \overset{heavy water (excess)}{⟶}$	II	${CD}_{4}$
C	${Al}_{4} C_{3} \overset{heavy water (large excess)}{⟶}$	III	$D_{2} {SO}_{3}$
		IV	$C_{2} D_{4}$
		V	$D_{2} {SO}_{4}$

The correct match is

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