chemistry : class12 Structure of Tetrathionic Acid : Structures of oxoacids of sulphur : p-Block Elements MCQ Questions and Answers
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Structure of Tetrathionic Acid
MCQ questions and answers.
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MCQ Questions
1. Which structural representation most accurately describes tetrathionic acid, H2S4O6?
A.
HO3S–S–S–SO3H
B.
H2S–O–S(=O)2–S(=O)2
C.
HO–S(=O)–S(=O)–S(=O)–OH
D.
H–S(=O)2–O–S(=O)2–H
Correct Answer:
HO3S–S–S–SO3H
Explanation:
Tetrathionic acid has a chain of four sulfur atoms. The two terminal sulfur atoms belong to –SO3H groups, while the two inner sulfur atoms are linked only through S–S bonds, giving the structure HO3S–S–S–SO3H.
2. In the structural formula HO3S–S–S–SO3H of tetrathionic acid, how many sulfur–sulfur bonds are present?
A.
One
B.
Two
C.
Three
D.
Four
Correct Answer:
Three
Explanation:
The four sulfur atoms form a continuous chain, so adjacent sulfur atoms are connected as S–S–S–S. This chain contains three sulfur–sulfur bonds.
3. Which statement correctly identifies the locations of the acidic hydrogen atoms in tetrathionic acid?
A.
Both hydrogen atoms are directly bonded to the two inner sulfur atoms
B.
Both hydrogen atoms are directly bonded to the terminal sulfur atoms
C.
Each hydrogen atom is bonded to an oxygen atom of a terminal –SO3H group
D.
One hydrogen atom is bonded to sulfur and the other to oxygen
Correct Answer:
Each hydrogen atom is bonded to an oxygen atom of a terminal –SO3H group
Explanation:
Tetrathionic acid contains two terminal sulfonic acid groups, –SO3H. Thus, both ionizable hydrogens are attached to oxygen atoms, not directly to sulfur.
4. What is the formal oxidation-state distribution of the four sulfur atoms in tetrathionic acid, H2S4O6, when the two terminal sulfur atoms are treated as equivalent?
A.
All four sulfur atoms are in the +2.5 oxidation state
B.
The terminal sulfur atoms are +5 each and the two inner sulfur atoms are 0 each
C.
The terminal sulfur atoms are +6 each and the inner sulfur atoms are −1 each
D.
The terminal sulfur atoms are +4 each and the inner sulfur atoms are +1 each
Correct Answer:
The terminal sulfur atoms are +5 each and the two inner sulfur atoms are 0 each
Explanation:
In H2S4O6, hydrogen contributes +2 and oxygen contributes −12, so the four sulfur atoms together contribute +10. The two terminal sulfur atoms in –SO3H groups are +5 each, while the two sulfur atoms in the central S–S segment have oxidation state 0.
5. Which structural feature distinguishes tetrathionic acid from sulfuric acid most directly?
A.
Tetrathionic acid contains no oxygen atoms
B.
Tetrathionic acid contains a four-sulfur chain with terminal –SO3H groups
C.
Tetrathionic acid contains only one sulfur atom bonded to oxygen
D.
Tetrathionic acid contains hydrogen atoms directly bonded to all sulfur atoms
Correct Answer:
Tetrathionic acid contains a four-sulfur chain with terminal –SO3H groups
Explanation:
The defining structural feature of tetrathionic acid is the S4 chain, represented as –SO3H–S–S–SO3H in connectivity terms. Sulfuric acid has only one sulfur atom and does not contain an S–S chain.
6. On complete deprotonation of tetrathionic acid, which structural ion is produced?
A.
[S4O6]2−, with the two terminal –OH groups converted to terminal –O− groups
B.
[S4O6]4−, with all sulfur–sulfur bonds cleaved
C.
[S2O3]2−, with the two inner sulfur atoms removed
D.
[S4O5]2−, with one oxygen atom lost from each terminal group
Correct Answer:
[S4O6]2−, with the two terminal –OH groups converted to terminal –O− groups
Explanation:
Removal of the two acidic protons from HO3S–S–S–SO3H gives the tetrathionate ion, [S4O6]2−. The S–S chain remains intact, while the terminal hydroxyl oxygens become negatively charged oxygens.
7. How many sulfur atoms in tetrathionic acid are directly bonded to oxygen atoms in its conventional structural representation?
A.
One
B.
Two
C.
Three
D.
Four
Correct Answer:
Two
Explanation:
Only the two terminal sulfur atoms belong to the –SO3H groups and are directly bonded to oxygen atoms. The two inner sulfur atoms are connected to sulfur atoms but not directly to oxygen.
8. Which bond-connectivity description is consistent with tetrathionic acid and its molecular formula H2S4O6?
A.
Two terminal sulfur atoms each bonded to three oxygens, joined through two additional sulfur atoms
B.
Four sulfur atoms each bonded to one oxygen and one hydrogen atom
C.
A cyclic S4 ring containing six oxygen bridges and two S–H bonds
D.
Two sulfur atoms joined by an oxygen bridge and two separate S–S bonds
Correct Answer:
Two terminal sulfur atoms each bonded to three oxygens, joined through two additional sulfur atoms
Explanation:
The structure contains two terminal –SO3H units, accounting for six oxygen atoms and two hydrogens. These terminal sulfur atoms are connected through two inner sulfur atoms, producing the four-sulfur chain.
9. If the two terminal sulfur atoms of tetrathionic acid are equivalent, which pair of structural descriptions is correct for the terminal and inner sulfur atoms, respectively?
A.
Terminal sulfur: oxygen-coordinated; inner sulfur: sulfur-coordinated only
B.
Terminal sulfur: bonded directly to hydrogen; inner sulfur: bonded directly to oxygen
C.
Terminal sulfur: part of an S–H group; inner sulfur: part of an O–O group
D.
Terminal sulfur: unconnected to the sulfur chain; inner sulfur: part of separate SO3 groups
Correct Answer:
Terminal sulfur: oxygen-coordinated; inner sulfur: sulfur-coordinated only
Explanation:
Each terminal sulfur is part of a –SO3H group and is connected to an inner sulfur atom. The two inner sulfur atoms form the central S–S segment and have no direct sulfur–oxygen bonds in the conventional structure.
10. Which combination correctly gives the numbers of S–S, S–O, and O–H bonds in one molecule of tetrathionic acid?
A.
3, 6, 2
B.
2, 6, 4
C.
3, 4, 2
D.
4, 6, 1
Correct Answer:
3, 6, 2
Explanation:
The S4 chain contributes three S–S bonds. The two terminal –SO3H groups contribute six S–O bonds in total, and each group contains one O–H bond, giving two O–H bonds.
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