Which of the following statements regarding the manufacture of H2SO4 by Contact process is not true?

Sulphur dioxide is produced by burning sulphur in excess of oxygen.S + O2 →Δ SO2Since combustion reactions are irreversible, (a) is incorrect.SO3 is produced by burning SO2 in oxygen2SO2(g) + O2(g) →Δ 2SO3(g)Since less number of molecule are there in the produced side than the reactant side, low temp, high pressure and a specific Catalyst like Pt. is required to produce maximum amount of SO3

Which of the following statements regarding the manufacture of H2SO4 by Contact process is not true?

Sulphur dioxide is produced by burning sulphur in excess of oxygen.S + O2 →Δ SO2Since combustion reactions are irreversible, (a) is incorrect.SO3 is produced by burning SO2 in oxygen2SO2(g) + O2(g) →Δ 2SO3(g)Since less number of molecule are there in the produced side than the reactant side, low temp, high pressure and a specific Catalyst like Pt. is required to produce maximum amount of SO3

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Which of the following statements regarding the manufacture of H₂SO₄ by Contact process is not true?

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Sulphur is burnt in air to form SO₂

H₂SO₄ obtained by contact process is of higher purity than that obtained by other processes

SO₂ is catalytically oxidised to SO₃

SO₃ is dissolved in water to get 100% sulphuric acid

answer is C.

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Detailed Solution

Sulphur dioxide is produced by burning sulphur in excess of oxygen.

$S + O_{2} \overset{Δ}{\to} {SO}_{2 }$

Since combustion reactions are irreversible, (a) is incorrect.

SO₃ is produced by burning SO₂ in oxygen

$2 S O_{2} (g) + O_{2} (g) \overset{Δ }{\to} 2 S O_{3} (g)$

Since less number of molecule are there in the produced side than the reactant side, low temp, high pressure and a specific Catalyst like Pt. is required to produce maximum amount of SO₃

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