The following changes represented by letters A, B, C, D can bring about the conversion of iron pyrites (FeS2) to sulphuric acid (H2SO4) in the contact process.FeS2 → A SO2 → B SO3 → C oleum → D H2SO4(i) Write the balanced equation to show change 'A'.(ii) Name the above reaction bringing about change 'A'.(iii) Write the formula of oleum.(iv) Name the substance C.(v) What is 'D'? Why is it required?(vi) State giving reasons, whether 'D' can be used in place of 'C'.

The following changes represented by letters A, B, C, D can bring abou

1.	The following changes represented by letters A, B, C, D can bring about the conversion of iron pyrites (FeS2) to sulphuric acid (H2SO4) in the contact process.FeS2 → A SO2 → B SO3 → C oleum → D H2SO4(i) Write the balanced equation to show change 'A'.(ii) Name the above reaction bringing about change 'A'.(iii) Write the formula of oleum.(iv) Name the substance C.(v) What is 'D'? Why is it required?(vi) State giving reasons, whether 'D' can be used in place of 'C'.
Answer» The following changes represented by letters A, B, C, D can bring about the conversion of iron pyrites (FeS₂) to sulphuric acid (H₂SO₄) in the contact process. ${FeS}_{2} \overset{A}{\to} {SO}_{2} \overset{B}{\to} {SO}_{3} \overset{C}{\to} oleum \overset{D}{\to} H_{2} {SO}_{4}$ (i) Write the balanced equation to show change 'A'. (ii) Name the above reaction bringing about change 'A'. (iii) Write the formula of oleum. (iv) Name the substance C. (v) What is 'D'? Why is it required? (vi) State giving reasons, whether 'D' can be used in place of 'C'.