Question 1

Which of the following is not an industrial process for isolation of elemental sulfur:

Accepted Answer

A)   Oswald process
B)   Frasch process
C)   Claus process A

Question 2

If a mixture of H2S2O7 and H2SO4 contains HS2O7- and H3SO4+, what can be concluded about relative strengths of these two acids:

Accepted Answer

A)   H2SO4 is a stronger acid than H2S2O7
B)   H2SO4 is a weaker acid than H2S2O7
C)   H2S2O7 is more basic than H2SO4 B

Question 3

Find incorrect statement regarding low reactivity of O2 molecule.

Accepted Answer

A)   It has a high bond energy.
B)   Its electronic configuration does not allow for Lewis acid/base reactivity.
C)   It easily forms stable complexes that impede any further reactivity. C

Question 4

Find correct statement(s) about sulfur oxides:
(i) SO2 is neither a Lewis acid nor a Lewis base.
(ii) Both SO2 and SO3 are acidic oxides.
(iii) SO2 is produced on a large scale in industry.

Accepted Answer

A)   (i)  and (ii) 
B)   (iii)  only
C)   (ii)  and (iii)

Question 5

Which polyanions frequently have bicyclic structures?

Accepted Answer

A)   Polysulfides.
B)   Polyselenides.
C)   Polytellurides.

Question 6

Which of the following species has the longest O-O bond:
(i) O2
(ii) O2-
(iii) O22-

Accepted Answer

A)   (i) 
B)   (ii) 
C)   (iii)

Question 7

Which metals form disulfides with layered structure?

Accepted Answer

A)   4d metals
B)   3d metals
C)   s block metals

Question 8

A steady increase in boiling points for hydrides of sulfur, selenium and tellurium can be attributed to:

Accepted Answer

A)   A decrease in vapour pressure
B)   An increase in molecular weight
C)   A decrease in hydrogen bond strength.

Question 9

Which of the following acids is an example of a polythionic acid?

Accepted Answer

A)   H2S2O7.
B)   H2S6O6.
C)   H2S2

Question 10

Both S4N4 and S2N2 are:

Accepted Answer

A)   thermodynamically unstable
B)   common precursors for sulfur chemistry in low oxidation states
C)   easy to handle.

Exam 16: The Group 16 Elements

Which of the following is not an industrial process for isolation of elemental sulfur:

If a mixture of H₂S₂O₇ and H₂SO₄ contains HS₂O₇^- and H₃SO₄⁺, what can be concluded about relative strengths of these two acids:

Find incorrect statement regarding low reactivity of O₂ molecule.

Find correct statement(s) about sulfur oxides: (i) SO₂ is neither a Lewis acid nor a Lewis base. (ii) Both SO₂ and SO₃ are acidic oxides. (iii) SO₂ is produced on a large scale in industry.

Which polyanions frequently have bicyclic structures?

Which of the following species has the longest O-O bond: (i) O₂ (ii) O₂^- (iii) O₂^2-

Which metals form disulfides with layered structure?

A steady increase in boiling points for hydrides of sulfur, selenium and tellurium can be attributed to:

Which of the following acids is an example of a polythionic acid?

Both S₄N₄ and S₂N₂ are:

Exam 16: The Group 16 Elements

Which of the following is not an industrial process for isolation of elemental sulfur:

If a mixture of H2S2O7 and H2SO4 contains HS2O7- and H3SO4+, what can be concluded about relative strengths of these two acids:

Find incorrect statement regarding low reactivity of O2 molecule.

Find correct statement(s) about sulfur oxides: (i) SO2 is neither a Lewis acid nor a Lewis base. (ii) Both SO2 and SO3 are acidic oxides. (iii) SO2 is produced on a large scale in industry.

Which polyanions frequently have bicyclic structures?

Which of the following species has the longest O-O bond: (i) O2 (ii) O2- (iii) O22-

Which metals form disulfides with layered structure?

A steady increase in boiling points for hydrides of sulfur, selenium and tellurium can be attributed to:

Which of the following acids is an example of a polythionic acid?

Both S4N4 and S2N2 are:

If a mixture of H₂S₂O₇ and H₂SO₄ contains HS₂O₇^- and H₃SO₄⁺, what can be concluded about relative strengths of these two acids:

Find incorrect statement regarding low reactivity of O₂ molecule.

Find correct statement(s) about sulfur oxides: (i) SO₂ is neither a Lewis acid nor a Lewis base. (ii) Both SO₂ and SO₃ are acidic oxides. (iii) SO₂ is produced on a large scale in industry.

Which of the following species has the longest O-O bond: (i) O₂ (ii) O₂^- (iii) O₂^2-

Both S₄N₄ and S₂N₂ are: