Which of the following is a hygroscopic substance?
Quicklime
Zinc chloride
Caustic potash
Caustic soda
Quicklime (calcium oxide) (CaO) is a hygroscopic substance. Others are deliquescent substances.
Define the following terms: (i) Constant boiling mixture (ii) Hygroscopic substance (iii) Oleum (iv) Dehydrating agent.