MHT CET · Chemistry · Classification of Elements and Periodicity in Properties

Which from following statements is true for group 16 elements?

A All elements of this group form \(\mathrm{EO}_2\) type oxides
B It includes all the nonmetals
C Oxides of all elements of this group are gaseous at room temperature
D Reducing properties of dioxides of this group element decreases form \(\mathrm{SO}_2\) to \(\mathrm{TeO}_2\)

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Answer & Solution

Correct Answer

(D) Reducing properties of dioxides of this group element decreases form \(\mathrm{SO}_2\) to \(\mathrm{TeO}_2\)

Step-by-step Solution

Detailed explanation

Besides \(\mathrm{EO}_2\) type, Sulphur, Selenium, and tellurium also form \(\mathrm{EO}_3\) type oxides.
Group 16 Elements: Oxygen and Sulfur are non-metals, Selenium and Tellurium are metalloids and Polonium is a metal under typical conditions.
All the elements of this group need 2 electrons to attain inert gas configuration either by gaining or sharing of electrons. Oxygen has high E.N so it gains two electrons to become inert gas configuration so all metal oxides are ionic and contains \(\mathrm{O}^{2-}\) in which the oxidation state is -2 . Oxygen shows \(-1,-1 / 2,+1\) and +2 oxidation state. The tendency to show -2 oxidation state decreases from sulphur to polonium.

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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