* not completed

. The electron configuration of Group 16 elements is ns²np⁴. This configuration suggests:

a maximum oxidation number of +6 correct incorrect

a maximum oxidation number of +4 correct incorrect

a maximum oxidation number of –2 correct incorrect

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. Sulfur-containing impurities that are naturally present in crude oil and natural gas are removed by:

fractional distillation correct incorrect

the Frasch process correct incorrect

the Claus process correct incorrect

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. Water can be viewed as a hydride of oxygen. By comparison with the heavier hydrides in the group, water's melting and boiling points are higher than expected because:

The water molecules have the shortest bond length of all Group 16 hydrides. correct incorrect

The water molecules form hydrogen bonds to a much higher degree than the remaining Group 16 hydrides. correct incorrect

The water molecules are the heaviest of all Group 16 hydrides. correct incorrect

* not completed

. The molecular geometry of the SF₄ molecule is:

tetrahedral correct incorrect

see-saw correct incorrect

octahedral correct incorrect

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. Which of the following reactions can be used to prepare given sulfide?

MgSO₄(s) + 4 C(s) → MgS(s) + 4 CO(g) correct incorrect

Na⁺(aq) + H₂S(aq) → Na₂S(s) + 2 H⁺(aq) correct incorrect

CrO₄^2–(aq) + S(s) + 8 H⁺ → CrS₂(s) + 4 H₂O(l) correct incorrect

* not completed

. Select the correct statement about the oxoanions of sulfur:

SO₃^2– is a strong oxidizing agent; SO₄^2– is a strong reducing agent; S₂O₈^2– is unreactive. correct incorrect

SO₃^2– is a strong reducing agent; SO₄^2– is a strong oxidizing agent; S₂O₈^2– is unreactive. correct incorrect

SO₃^2– is a strong reducing agent; SO₄^2– is unreactive; S₂O₈^2– is strong oxidizing agent. correct incorrect

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. Dioxygen readily removes electrons from metals to form a variety of metal oxides. In general:

Oxides of M²⁺ ions (MO formula) have a rock salt structure (6:6 coordination). correct incorrect

Oxides of M³⁺ ions (M₂O₃ formula) have a fluorite structure (6:3 and 8:4 coordination). correct incorrect

Oxides with an MO₄ formula have a 6:4 coordination. correct incorrect

* not completed

. S, Se, and Te form polyanions as follows (find the correct statement):

S forms chains and bicyclic ring polysulfides. correct incorrect

Se forms chain and ring polyselenides. correct incorrect

Te forms chain polytellurides only. correct incorrect

* not completed

. Find the statement that correctly describes oxoacids of sulfur:

Sulfuric acid decomposes but forms stable salts. correct incorrect

Thiosulfuric acid is a strong acid. correct incorrect

Sulfurous acid is actually an aqueous solution of SO₂. correct incorrect

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. Sulfur-nitrogen compounds:

can decompose explosively correct incorrect

are stable correct incorrect

do not exist correct incorrect