COMEDK · Chemistry · 11. s Block Elements

Choose the incorrect statement.

A Alkali and Alkaline earth metals cannot be produced by chemical reduction methods.
B \(\mathrm{LiF}\) and \(\mathrm{Li}_3 \mathrm{~N}\) are thermally stable compounds.
C n the vapour phase \(\mathrm{BeCl}_2\) has a polymeric chain structure consisting of numerous \(\mathrm{BeCl}_2\) units.
D When equimolar aqueous solutions of \(\mathrm{SrCl}_2, \mathrm{MgCl}_2\) and \(\mathrm{BaCl}_2\) are taken and their \(\mathrm{pH}\) is recorded, \(\mathrm{BaCl}_2\) solution recorded the highest \(\mathrm{pH}\).

Verified Solution

Answer & Solution

Correct Answer

(C) n the vapour phase \(\mathrm{BeCl}_2\) has a polymeric chain structure consisting of numerous \(\mathrm{BeCl}_2\) units.

Step-by-step Solution

Detailed explanation

Correct option is C.

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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