ANS:A - 1

The diameter to height ratio for a Raschig ring is typically 1. Raschig rings are commonly used as random packing materials in distillation columns, absorption towers, and other types of chemical processing equipment. They are cylindrical in shape, with a height approximately equal to their diameter, resulting in a diameter to height ratio of approximately 1:1. This shape allows for efficient packing within the column while providing good void space for gas and liquid flow.