ICSE CHEMISTRY GIVE REASONS - Calcium oxide (quick lime) and Phosphorus pentoxide are not used to purify Hydrogen chloride gas

Calcium oxide (quick lime) and Phosphorus pentoxide are not used to purify Hydrogen chloride gas 

Calcium oxide (quick lime) and Phosphorus pentoxide are not used to purify Hydrogen chloride gas because they react with HCl as shown:

                                CaO + 2HCl -->    CaCl₂ + H₂O

                                2P₂O₅ + 3HCl --> POCl₃ + 3HPO₃