chemistry : class12 Structure of Peroxomonosulfuric Acid : Structures of oxoacids of sulphur : p-Block Elements MCQ Questions and Answers
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Structure of Peroxomonosulfuric Acid
MCQ questions and answers.
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MCQ Questions
1. Which structural formula correctly represents peroxomonosulfuric acid (Caro's acid), H2SO5?
A.
HO−S(=O)2−OH
B.
HO−S(=O)2−O−OH
C.
HO−S(−OH)2−O−O−H
D.
H−O−O−S(=O)2−O−H
Correct Answer:
HO−S(=O)2−O−OH
Explanation:
Peroxomonosulfuric acid has sulfur bonded to two terminal oxo groups, one hydroxyl group, and one hydroperoxy group. Its structure is HO−S(=O)2−O−OH, containing an O−O peroxide linkage.
2. In the structure HO−S(=O)2−O−OH of peroxomonosulfuric acid, which pair of atoms forms the peroxide linkage?
A.
The sulfur atom and the hydroxyl oxygen
B.
The two sulfur-bound oxo oxygens
C.
The oxygen atoms in −O−OH
D.
The hydroxyl oxygen and a sulfur-bound oxo oxygen
Correct Answer:
The oxygen atoms in −O−OH
Explanation:
A peroxide linkage is an O−O single bond. In peroxomonosulfuric acid, it occurs in the −O−O−H hydroperoxy group attached to sulfur through one of its oxygen atoms.
3. How many sulfur–oxygen bonds of each indicated type are present in the Lewis structure of H2SO5, represented as HO−S(=O)2−O−OH?
A.
Two S=O bonds, one S−O(H) bond, and one S−O−O(H) bond
B.
One S=O bond, two S−O(H) bonds, and one S−O−O(H) bond
C.
Two S=O bonds and two S−O(H) bonds
D.
Three S=O bonds and one S−O−O(H) bond
Correct Answer:
Two S=O bonds, one S−O(H) bond, and one S−O−O(H) bond
Explanation:
The structure contains four sulfur–oxygen connections: two S=O bonds, one S−O bond leading to hydroxyl, and one S−O bond leading to the peroxide group −O−OH.
4. Which statement correctly distinguishes the two hydrogen-containing groups in the structure of peroxomonosulfuric acid?
A.
Both hydrogens are bonded directly to sulfur.
B.
One hydrogen is on a hydroxyl oxygen and the other is on the terminal oxygen of a hydroperoxy group.
C.
Both hydrogens are bonded to the same oxygen atom.
D.
One hydrogen is bonded to sulfur and the other to an oxo oxygen.
Correct Answer:
One hydrogen is on a hydroxyl oxygen and the other is on the terminal oxygen of a hydroperoxy group.
Explanation:
In HO−S(=O)2−O−OH, one hydrogen belongs to the ordinary −OH group, while the second belongs to the terminal oxygen of the −O−O−H peroxide-containing group.
5. What is the oxidation state of sulfur in peroxomonosulfuric acid, H2SO5, when the peroxide oxygen atoms are assigned an oxidation state of −1?
A.
+4
B.
+5
C.
+6
D.
+7
Correct Answer:
+6
Explanation:
In H2SO5, the two peroxide oxygens contribute −2 in total, while the other three oxygens contribute −6 and the two hydrogens contribute +2. Thus x + 2 − 8 = 0, giving sulfur an oxidation state of +6.
6. Which feature of the structure of peroxomonosulfuric acid directly identifies it as a peroxo oxoacid rather than an ordinary oxoacid of sulfur?
A.
The presence of two S=O bonds
B.
The presence of an S−OH bond
C.
The presence of an O−O bond in the −O−OH group
D.
The presence of sulfur in the +6 oxidation state
Correct Answer:
The presence of an O−O bond in the −O−OH group
Explanation:
The defining structural feature of a peroxo acid is an O−O single bond. Peroxomonosulfuric acid contains this bond in its hydroperoxy substituent, −O−OH.
7. Considering the sulfur atom in the conventional expanded-octet structure of peroxomonosulfuric acid, how many sigma and pi bonds are associated with sulfur?
A.
Four sigma bonds and two pi bonds
B.
Six sigma bonds and no pi bonds
C.
Four sigma bonds and four pi bonds
D.
Two sigma bonds and two pi bonds
Correct Answer:
Four sigma bonds and two pi bonds
Explanation:
Sulfur is connected to four oxygen atoms, giving four sigma bonds. The two S=O double bonds each contribute one pi bond, so sulfur is associated with two pi bonds.
8. How many oxygen atoms in the structure of peroxomonosulfuric acid are directly bonded to sulfur?
A.
Two
B.
Three
C.
Four
D.
Five
Correct Answer:
Four
Explanation:
In HO−S(=O)2−O−OH, sulfur is directly bonded to two doubly bonded oxo oxygens, the hydroxyl oxygen, and one oxygen of the peroxide group. The terminal peroxide oxygen is not directly bonded to sulfur.
9. Which description of the oxygen atoms in HO−S(=O)2−O−OH is structurally correct?
A.
There are two oxo oxygens, one hydroxyl oxygen, and two peroxide oxygens.
B.
There are three oxo oxygens, one hydroxyl oxygen, and one peroxide oxygen.
C.
There are two oxo oxygens, two hydroxyl oxygens, and one peroxide oxygen.
D.
There is one oxo oxygen, two hydroxyl oxygens, and two peroxide oxygens.
Correct Answer:
There are two oxo oxygens, one hydroxyl oxygen, and two peroxide oxygens.
Explanation:
The structure contains two S=O oxo oxygens, one oxygen in the S−OH hydroxyl group, and two oxygen atoms joined by the O−O peroxide bond.
10. If the hydroperoxy group in peroxomonosulfuric acid is cleaved conceptually at its O−O bond, which structural fragment remains directly attached to sulfur?
A.
A terminal oxo group, S=O
B.
A hydroxyl group, S−OH
C.
An oxygen atom singly bonded to sulfur, S−O−
D.
A sulfur–hydrogen bond, S−H
Correct Answer:
An oxygen atom singly bonded to sulfur, S−O−
Explanation:
The peroxide-containing substituent is S−O−O−H. Cleaving its O−O bond leaves the oxygen directly attached to sulfur as the S−O portion; the terminal oxygen bears hydrogen in the original hydroperoxy group.
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