Rhombic sulphur (α-sulphur) is:
In the contact process, the purification of Sulphur dioxide is done by:
In the laboratory preparation of hydrogen sulphide, if the gas is required dry, it is passed through a U-tube containing:
The suitable pressure and temperature range for the contact process (industrial manufacture of sulphuric acid) is:
In the contact process, the purification of Sulphur dioxide to:
