Q20. The manufacture of sulphuric acid involves the following steps. Identify X₁, X₂, X₃ and X₄ in t

Q: What is the correct answer for CUET UG Chemistry Q20?

The correct answer is a. This question describes the Contact Process for the industrial manufacture of sulfuric acid (H₂SO₄).1. **(i) X₁ + O₂(g) → SO₂(g)** This is the first step where sulfur dioxide is produced. This is typically done by burning elemental sulfur in air: S(s) + O₂(g) → SO₂(g) So, X₁ = S.2. **(ii) 2SO₂(g) + O₂ --(X₂)--> 2X₃** This is the key catalytic oxidation step where sulfur dioxide is co

Q: Q20. The manufacture of sulphuric acid involves the following steps. Identify X₁, X₂, X₃ and X₄ in the reactions involved: (i) X₁ + O₂(g) → SO₂(g) (ii) 2SO₂(g) + O₂ --(X₂)--> 2X₃ (iii) X₃ + H₂SO₄ → X₄

The correct answer is a. This question describes the Contact Process for the industrial manufacture of sulfuric acid (H₂SO₄).1. **(i) X₁ + O₂(g) → SO₂(g)** This is the first step where sulfur dioxide is produced. This is typically done by burning elemental sulfur in air: S(s) + O₂(g) → SO₂(g) So, X₁ = S.2. **(ii) 2SO₂(g) + O₂ --(X₂)--> 2X₃** This is the key catalytic oxidation step where sulfur dioxide is co

Q: What are the options for this CUET UG Chemistry question?

A. X₁: S, X₂: V₂O₅, X₃: SO₃, X₄: H₂S₂O₇ · B. X₁: SO₃, X₂: V₂O₃, X₃: S, X₄: H₂SO₅ · C. X₁: H₂S, X₂: VO₂, X₃: SO₃, X₄: H₂SO₅ · D. X₁: S, X₂: V₂O₃, X₃: SO₃, X₄: H₂S₂O₇

Question

Q20. The manufacture of sulphuric acid involves the following steps. Identify X₁, X₂, X₃ and X₄ in the reactions involved:
(i) X₁ + O₂(g) → SO₂(g)
(ii) 2SO₂(g) + O₂ --(X₂)--> 2X₃
(iii) X₃ + H₂SO₄ → X₄

FirstInTest · Accepted Answer

This question describes the Contact Process for the industrial manufacture of sulfuric acid (H₂SO₄).1.  **(i) X₁ + O₂(g) → SO₂(g)**    This is the first step where sulfur dioxide is produced. This is typically done by burning elemental sulfur in air:    S(s) + O₂(g) → SO₂(g)    So, X₁ = S.2.  **(ii) 2SO₂(g) + O₂ --(X₂)--> 2X₃**    This is the key catalytic oxidation step where sulfur dioxide is converted to sulfur trioxide. The catalyst used is vanadium pentoxide (V₂O₅), and the product is sulfur trioxide (SO₃).    2SO₂(g) + O₂(g) --(V₂O₅)--> 2SO₃(g)    So, X₂ = V₂O₅ and X₃ = SO₃.3.  **(iii) X₃ + H₂SO₄ → X₄**    Sulfur trioxide (SO₃) is not directly absorbed in water because it forms a mist of sulfuric acid. Instead, it is absorbed in concentrated sulfuric acid to produce oleum (pyrosulfuric acid).    SO₃(g) + H₂SO₄(l) → H₂S₂O₇(l) (Oleum)    So, X₄ = H₂S₂O₇.Combining these identifications:X₁ = S, X₂ = V₂O₅, X₃ = SO₃, X₄ = H₂S₂O₇.This set of identifications matches option (a).

Answer

X₁: S, X₂: V₂O₅, X₃: SO₃, X₄: H₂S₂O₇

Answer

X₁: SO₃, X₂: V₂O₃, X₃: S, X₄: H₂SO₅

Answer

X₁: H₂S, X₂: VO₂, X₃: SO₃, X₄: H₂SO₅

Answer

X₁: S, X₂: V₂O₃, X₃: SO₃, X₄: H₂S₂O₇

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