When burned, sulfur forms a gaseous product X which can be oxidised to produce a gas Y - CIE - A-Level Chemistry - Question 18 - 2018 - Paper 1
Question 18
When burned, sulfur forms a gaseous product X which can be oxidised to produce a gas Y.
Gas Y reacts with water to produce a product Z.
Which row correctly shows th... show full transcript
Worked Solution & Example Answer:When burned, sulfur forms a gaseous product X which can be oxidised to produce a gas Y - CIE - A-Level Chemistry - Question 18 - 2018 - Paper 1
Step 1
Determine the oxidation state of sulfur in gaseous product X
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Answer
When sulfur is burned, it typically forms sulfur dioxide (SO₂) as a gaseous product X. In SO₂, the oxidation state of sulfur is +4. Therefore, we can assign the oxidation state of sulfur in product X as +4.
Step 2
Determine the oxidation state of sulfur in gas Y
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Answer
The gaseous product Y is commonly known as sulfur trioxide (SO₃), formed by oxidizing sulfur dioxide. In SO₃, the oxidation state of sulfur is +6. Thus, the oxidation state of sulfur in gas Y is +6.
Step 3
Determine the oxidation state of sulfur in product Z
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Answer
When product Y (sulfur trioxide) reacts with water, it forms sulfuric acid (H₂SO₄) as product Z. In H₂SO₄, the oxidation state of sulfur remains +6. Therefore, the oxidation state of sulfur in product Z is +6.
Step 4
Choose the correct row for oxidation states in X, Y, and Z
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Answer
From the analysis, the oxidation states of sulfur are as follows:
For X: +4
For Y: +6
For Z: +6
Thus, the correct row that shows these oxidation states is option D: +4, +6, +6.
