Multiple choice Which of the following is not used as a drying agent? Conc H2SO4 Solid NaCl Anhy CaCl2 CaO Reveal answer Fill a bubble to check yourself B Correct answer Explanation Solid NaCl is a norml salt. Salts which produce one simple cation and one simple anion in aqueous solution are called normal salts.The ions present in simple salt can be tested easily.