Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Why calcium oxide cannot be used as a drying agent in laboratory preparation of HCl?

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> CaO undergoes a chemical reaction with HCl and therefore, cannot be used as a drying agent.
$2HCl+CaO\to CaC{l}_2+H_{2}O$