During the production of sulphuric acid by the contact process, the three reactions represented by the equations below occur.

S(l) + O₂(g) → SO₂(g)

2SO₂(g) + O₂(g) → 2SO₃(g)

SO₃(g) + H₂SO₄(l) → H₂S₂O₇(l)

Which of the following statements is true for all three of these reactions?

All occur at elevated pressures to ensure maximum yield.

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All take place at high temperatures to increase the reaction rate

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All are redox reactions

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All are exothermic

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Solution

The correct option is D
All are exothermic

All are exothermic. 1 and 2 are redox, but 3 is not. High temperatures and pressures are not used for all reactions here. For example, 3 takes place rapidly and completely at room temperature and pressure, so elevated pressures and temperatures are not required.

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Similar questions

Q. During the production of sulphuric acid by the contact process, the three reactions represented by the equations below occur.

S(l) + O₂(g) → SO₂(g)

2SO₂(g) + O₂(g) → 2SO₃(g)

SO₃(g) + H₂SO₄(l) → H₂S₂O₇(l)

Which of the following statements is true for all three of these reactions?

Write balanced equations for the three chemical reactions that take place during the conversion of sulphur dioxide to sulphuric acid in the contact process. Name the catalyst used in the contact process.

According to classical idea of redox reactions the given example is of

2 Mg_(s) + O_{2 (g)} → 2 MgO_(s)

Q. Balance the following redox equations by the oxidation number method. The reactions occur in acidic medium.

H_{2} O_{2 (a q)} + C r_{2} O_{7}^{2 -} (a q) \to O_{2 (g)} + C r_{(a q)}^{3 +}

A l_{(g)} + O_{2 (g)} ⟶ A l_{2} O_{3 (g)}

When the equation for the reaction represented above is balanced and all coefficients are reduced to lowest whole number terms, the coefficient for

A l_{(g)}

is :

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During the production of sulphuric acid by the contact process, the three reactions represented by the equations below occur. S(l) + O2(g) → SO2(g) 2SO2(g) + O2(g) → 2SO3(g) SO3(g) + H2SO4(l) → H2S2O7(l) Which of the following statements is true for all three of these reactions?