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

Which one of the following pairs of reactants does not form oxygen when they react with each other?

A \(\mathrm{F}_2, \mathrm{NaOH}\) solution (hot, conc.)
B \(\mathrm{F}_2, \mathrm{H}_2 \mathrm{O}\)
C \(\mathrm{Cl}_2, \mathrm{NaOH}\) solution (cold, dilute)
D \(\mathrm{CaOCl}_2, \mathrm{H}_2 \mathrm{SO}_4\) (dilute, small amount)

Verified Solution

Answer & Solution

Correct Answer

(C) \(\mathrm{Cl}_2, \mathrm{NaOH}\) solution (cold, dilute)

Step-by-step Solution

Detailed explanation

\(\mathrm{Cl}_2+\underset{\text { cold, dil }}{2 \mathrm{NaOH}} \longrightarrow \mathrm{NaCl}+\mathrm{NaClO}+\mathrm{H}_2 \mathrm{O}\) Chlorine react with cold and dilute NaOH to give sodium hypochlorite.

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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