chemistry : class12 Structure of Peroxodisulfuric Acid : Structures of oxoacids of sulphur : p-Block Elements MCQ Questions and Answers
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Structure of Peroxodisulfuric Acid
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MCQ Questions
1. Which structural representation correctly describes peroxodisulfuric acid, H2S2O8?
A.
HO–S(=O)2–O–O–S(=O)2–OH
B.
HO–S(=O)2–O–S(=O)2–OH with one terminal O–O bond
C.
H–O–S(=O)–O–O–S(=O)–O–H
D.
HO–S(=O)–O–O–S(=O)–OH with one S–S bond
Correct Answer:
HO–S(=O)2–O–O–S(=O)2–OH
Explanation:
Peroxodisulfuric acid has two sulfur atoms joined through a peroxide O–O linkage. Each sulfur is bonded to two terminal oxo groups and one hydroxyl group, giving the structure HO–S(=O)2–O–O–S(=O)2–OH.
2. In the accepted structural formula HO–S(=O)2–O–O–S(=O)2–OH of peroxodisulfuric acid, which bond identifies the peroxide linkage?
A.
The S–OH bond
B.
The S=O bond
C.
The central O–O bond
D.
The S–O bond connecting each sulfur to the central group
Correct Answer:
The central O–O bond
Explanation:
The defining structural feature of peroxodisulfuric acid is the O–O peroxide bond connecting the two sulfur-containing groups. The hydroxyl and terminal S=O bonds are also present but are not peroxide linkages.
3. How many hydroxyl groups and peroxide oxygen atoms, respectively, are present in one molecule of peroxodisulfuric acid?
A.
Two hydroxyl groups and two peroxide oxygen atoms
B.
Two hydroxyl groups and one peroxide oxygen atom
C.
One hydroxyl group and two peroxide oxygen atoms
D.
Four hydroxyl groups and no peroxide oxygen atoms
Correct Answer:
Two hydroxyl groups and two peroxide oxygen atoms
Explanation:
The structure HO–S(=O)2–O–O–S(=O)2–OH contains two terminal –OH groups and one O–O unit. Since an O–O unit contains two oxygen atoms, there are two hydroxyl groups and two peroxide oxygen atoms.
4. Which statement about the two sulfur centers in peroxodisulfuric acid is structurally correct?
A.
Each sulfur is bonded to one hydroxyl oxygen, two terminal oxo oxygens, and one bridging peroxide oxygen.
B.
Each sulfur is bonded to two hydroxyl oxygens, one terminal oxo oxygen, and one sulfur atom.
C.
One sulfur is bonded to three oxo oxygens, while the other is bonded to three hydroxyl oxygens.
D.
The two sulfur atoms are directly bonded to each other and have no bridging oxygen.
Correct Answer:
Each sulfur is bonded to one hydroxyl oxygen, two terminal oxo oxygens, and one bridging peroxide oxygen.
Explanation:
In HO–S(=O)2–O–O–S(=O)2–OH, each sulfur has four oxygen attachments: one hydroxyl oxygen, two terminal oxo oxygens, and one oxygen belonging to the central O–O bridge.
5. Which formula correctly accounts for the oxygen atoms in the structural formula of peroxodisulfuric acid?
A.
Four terminal S=O oxygens, two hydroxyl oxygens, and two peroxide oxygens
B.
Two terminal S=O oxygens, four hydroxyl oxygens, and two peroxide oxygens
C.
Four terminal S=O oxygens, one hydroxyl oxygen, and three peroxide oxygens
D.
Two terminal S=O oxygens, two hydroxyl oxygens, and four bridging sulfur oxygens
Correct Answer:
Four terminal S=O oxygens, two hydroxyl oxygens, and two peroxide oxygens
Explanation:
Each of the two sulfur atoms bears two terminal S=O groups, contributing four oxygens. The two –OH groups contribute two more, and the central O–O peroxide linkage contributes two, totaling eight oxygen atoms.
6. If the central O–O bond is removed from the structural framework of peroxodisulfuric acid while the two sulfur-containing fragments remain, which type of structural feature is lost?
A.
The hydroxyl functionality only
B.
The peroxide functionality
C.
All terminal sulfur–oxygen bonds
D.
The direct sulfur–sulfur bond
Correct Answer:
The peroxide functionality
Explanation:
The peroxide functionality is specifically the O–O linkage. Removing the central O–O bond eliminates the peroxide bridge, whereas the hydroxyl groups and terminal S=O bonds are separate structural features.
7. Which comparison between peroxodisulfuric acid and sulfuric acid is correct on the basis of their structural formulas?
A.
Peroxodisulfuric acid contains an O–O linkage absent in sulfuric acid and has two sulfur centers.
B.
Peroxodisulfuric acid contains an S–S linkage absent in sulfuric acid and has one sulfur center.
C.
Both acids contain the same number of sulfur centers and differ only in the number of hydroxyl groups.
D.
Sulfuric acid contains the O–O linkage, whereas peroxodisulfuric acid contains only S–O–S linkages.
Correct Answer:
Peroxodisulfuric acid contains an O–O linkage absent in sulfuric acid and has two sulfur centers.
Explanation:
Peroxodisulfuric acid is represented as HO–S(=O)2–O–O–S(=O)2–OH, containing two sulfur centers and a peroxide bridge. Sulfuric acid has one sulfur center and no O–O bond.
8. In the structural formula of peroxodisulfuric acid, how many oxygen atoms are directly bonded to sulfur through each sulfur center?
A.
Two
B.
Three
C.
Four
D.
Five
Correct Answer:
Four
Explanation:
Each sulfur is directly attached to four oxygen atoms: two terminal oxo oxygens, one hydroxyl oxygen, and one oxygen of the peroxide bridge. The two peroxide oxygens are bonded to each other, but each is also bonded to one sulfur.
9. Which description correctly distinguishes the oxygen atoms in peroxodisulfuric acid according to their positions in the structure?
A.
All eight oxygen atoms are equivalent terminal oxo atoms.
B.
Two oxygen atoms form an O–O bridge, two belong to –OH groups, and four are terminal oxo oxygens.
C.
Two oxygen atoms form an S–S bridge, two belong to –OH groups, and four are terminal oxo oxygens.
D.
Four oxygen atoms form two O–O bridges, while the remaining four belong to –OH groups.
Correct Answer:
Two oxygen atoms form an O–O bridge, two belong to –OH groups, and four are terminal oxo oxygens.
Explanation:
The structure contains one O–O bridge, which uses two oxygens, two hydroxyl groups, which use two oxygens, and four terminal S=O oxygens. These distinct positions account for all eight oxygen atoms.
10. Which structural modification would incorrectly represent peroxodisulfuric acid as a non-peroxo oxoacid?
A.
Replacing the central O–O unit by a direct S–S bond
B.
Showing two –OH groups, one on each sulfur
C.
Showing two terminal S=O groups on each sulfur
D.
Showing an O–O unit between the two sulfur-containing groups
Correct Answer:
Replacing the central O–O unit by a direct S–S bond
Explanation:
Peroxodisulfuric acid is defined structurally by the peroxide O–O bridge between the two sulfur centers. Replacing that bridge with an S–S bond removes the peroxide linkage and gives an incorrect structural representation.
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