Question:
Which of the following source materials generate \(SO_2\) that is used in contact process?
Which of the following source materials generate \(SO_2\) that is used in contact process?
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In the contact process, \(SO_2\) is mainly obtained by burning sulphur or roasting iron pyrites \((FeS_2)\).
Updated On: Jun 25, 2026
- \(S,\ FeS_2\)
- \(S,\ FeS\)
- \(H_2S,\ FeS_2\)
- \(Na_2S,\ FeS_2\)
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The Correct Option is A
Solution and Explanation
Step 1: Recall the contact process.
In the contact process, sulphur dioxide: \[ SO_2 \] is first produced and then oxidized to: \[ SO_3 \]
Step 2: Identify industrial sources of \(SO_2\).
Sulphur dioxide is commercially prepared by: (i) Burning sulphur \[ S+O_2\rightarrow SO_2 \] and by roasting iron pyrites: \[ 4FeS_2+11O_2\rightarrow 2Fe_2O_3+8SO_2 \] Thus, both: \[ S \quad \text{and} \quad FeS_2 \] are used as source materials.
Step 3: Check remaining options.
\[ FeS \] is not commonly used in contact process for \(SO_2\) manufacture.
\[ H_2S \] and \[ Na_2S \] are also not industrial source materials used in the contact process.
Step 4: Final conclusion.
Hence, the correct answer is \[ \boxed{S,\ FeS_2} \]
In the contact process, sulphur dioxide: \[ SO_2 \] is first produced and then oxidized to: \[ SO_3 \]
Step 2: Identify industrial sources of \(SO_2\).
Sulphur dioxide is commercially prepared by: (i) Burning sulphur \[ S+O_2\rightarrow SO_2 \] and by roasting iron pyrites: \[ 4FeS_2+11O_2\rightarrow 2Fe_2O_3+8SO_2 \] Thus, both: \[ S \quad \text{and} \quad FeS_2 \] are used as source materials.
Step 3: Check remaining options.
\[ FeS \] is not commonly used in contact process for \(SO_2\) manufacture.
\[ H_2S \] and \[ Na_2S \] are also not industrial source materials used in the contact process.
Step 4: Final conclusion.
Hence, the correct answer is \[ \boxed{S,\ FeS_2} \]
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