Question

Which of the following substance(s) is/are used in laboratory for drying purposes?

• A. Anhydrous $P_2{O}_5$
• B. Graphite
• C. Anhydrous $Ca{Cl}_2$
• D. ${Na}_{3}P{O}_4$

Answer 1

Answer: (A), (C)

Anhydrous $Ca{Cl}_2$
Anhydrous $P_2{O}_5$

Commonly used drying agents in organic laboratories are calcium chloride ($CaC{l}_2$), sodium sulfate ($N{a}_{2}S{O}_4$) calcium sulfate ($CaS{O}_4$), also known as Drierite) and magnesium sulfate ($MgS{O}_4$), Phosporous pentaoxide ($P_2{O}_5$),all in their anhydrous form.
Hence options A & C are correct.