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Sulphuric Acid — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistrySulphuric Acid1 Mark
MCQ
In the contact process, which step must be performed prior to proceeding?
  • A
    Addition of sulphur dioxide
  • B
    Removal of arsenic impurity
  • C
    Cooling the reaction mixture
  • D
    Heating the reaction vessel
✓

Answer

B. Removal of arsenic impurity
Explanation : Sulphur dioxide is purified by removing dust and arsenic impurities. Arsenic is a catalyst poison for vanadium pentoxide catalyst. Hence, it has to be removed completely before entering into the catalytic chamber.

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