ANS:B - dry bulb temperature remains constant.

In a chemical dehumidification process, the dry bulb temperature remains constant. Chemical dehumidification involves the use of desiccants, which are substances that have a high affinity for water vapor. These desiccants absorb moisture from the air, effectively reducing the humidity level. During the process, the dry bulb temperature of the air remains constant because chemical dehumidification does not involve heating or cooling the air. Instead, it focuses on removing moisture from the air using desiccant materials. As the air passes through the desiccant material, moisture is absorbed, leading to a decrease in relative humidity. However, the dry bulb temperature of the air remains unchanged because there is no addition or removal of heat during the dehumidification process. Therefore, in a chemical dehumidification process, the dry bulb temperature remains constant.