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9701 MCQ Solution 76
Question 76: [Inorganic > Group 7]
Why is the addition of concentrated sulphuric acid to solid potassium iodide unsuitable for the
preparation of hydrogen iodide?
1 Hydrogen iodide is not displaced by sulphuric acid. 2 Iodide ions are oxidised to iodine. 3 The product is contaminated by sulphur compounds.
1 Hydrogen iodide is not displaced by sulphuric acid. 2 Iodide ions are oxidised to iodine. 3 The product is contaminated by sulphur compounds.
Reference: Past Exam Paper -June 2003 Paper 1 Q36
Solution 76:
Answer: C.
Statement 1 is false because sulphuric acid is a stronger oxidizing agent than hydrogen iodide so iodine can be displaced by sulphuric acid
Statement 2 is true as H2SO4 displaces HI to H2S and I2 and H2O
Statement 3 is true as there are sulphur compounds present, H2S and SO2
Statement 2 is true as H2SO4 displaces HI to H2S and I2 and H2O
Statement 3 is true as there are sulphur compounds present, H2S and SO2
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