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  1. 1.

    SO2 acts as a bleaching agent by:

  2. 2.

    In the Contact process, the catalyst used for SO2 to SO3 conversion is:

  3. 3.

    Hot concentrated H2SO4 can dissolve Cu because:

  4. 4.

    SF6 exists but OF6 does not because:

  5. 5.

    The most stable allotrope of sulphur at room temperature is:

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