1. What is the commonly represented structural formula of sulphurous acid, H₂SO₃?
A.
HO−S(=O)−OH
B.
H−S(=O)₂−OH
C.
HO−S(−OH)₂
D.
H₂S−O₃
Correct Answer:
HO−S(=O)−OH
Explanation:
H₂SO₃ is commonly represented as HO−S(=O)−OH, containing one S=O bond and two S−OH groups.
2. How many hydroxyl (−OH) groups are present in the commonly accepted structure of H₂SO₃?
A.
One
B.
Two
C.
Three
D.
None
Correct Answer:
Two
Explanation:
The structure HO−S(=O)−OH contains two hydroxyl groups attached directly to the sulfur atom.
3. How many sulfur–oxygen bonds are present around the sulfur atom in the structure HO−S(=O)−OH?
A.
One
B.
Two
C.
Three
D.
Four
Correct Answer:
Three
Explanation:
Sulfur is bonded to three oxygen atoms: one by a double bond and two by single bonds to hydroxyl groups.
4. In the usual structural representation of H₂SO₃, how many S−OH single bonds are present?
A.
One
B.
Two
C.
Three
D.
Four
Correct Answer:
Two
Explanation:
The formula HO−S(=O)−OH shows two single bonds between sulfur and hydroxyl groups.
5. What is the oxidation state of sulfur in H₂SO₃?
A.
+2
B.
+4
C.
+6
D.
−2
Correct Answer:
+4
Explanation:
In H₂SO₃, hydrogen is +1 and oxygen is −2. Therefore, sulfur has oxidation state +4: 2(+1) + S + 3(−2) = 0.
6. What is the arrangement of atoms directly bonded to sulfur in the commonly represented structure of H₂SO₃?
A.
One oxygen atom
B.
Two oxygen atoms
C.
Three oxygen atoms
D.
Four hydrogen atoms
Correct Answer:
Three oxygen atoms
Explanation:
In HO−S(=O)−OH, the sulfur atom is directly bonded to three oxygen atoms.
7. What is the molecular shape around the sulfur atom in the usual structure of H₂SO₃?
A.
Linear
B.
Trigonal planar
C.
Trigonal pyramidal
D.
Tetrahedral with no lone pair
Correct Answer:
Trigonal pyramidal
Explanation:
Sulfur has three bonding regions and one lone pair in H₂SO₃, giving a trigonal pyramidal molecular shape.
8. How many lone pairs are present on the sulfur atom in the commonly used Lewis structure of H₂SO₃?
A.
Zero
B.
One
C.
Two
D.
Three
Correct Answer:
One
Explanation:
The sulfur atom in the usual Lewis structure of H₂SO₃ has one lone pair along with its bonds to three oxygen atoms.
9. Which type of sulfur–oxygen bond is shown in the usual structural formula of H₂SO₃ besides the two S−OH bonds?
A.
One S=O double bond
B.
Two S=O double bonds
C.
One S−S single bond
D.
One S−H single bond
Correct Answer:
One S=O double bond
Explanation:
The commonly represented structure HO−S(=O)−OH includes one sulfur–oxygen double bond in addition to two S−OH single bonds.
10. Which statement correctly describes the two hydrogen atoms in the structure of H₂SO₃?
A.
Both hydrogen atoms are directly bonded to sulfur
B.
Both hydrogen atoms are attached to oxygen atoms
C.
One hydrogen atom is bonded to sulfur and one to oxygen
D.
The hydrogen atoms form a hydrogen–hydrogen bond
Correct Answer:
Both hydrogen atoms are attached to oxygen atoms
Explanation:
In HO−S(=O)−OH, each hydrogen is part of an −OH group, so both hydrogen atoms are bonded to oxygen rather than directly to sulfur.
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