What is dry ice ? Why is it called so ? How to prepare a pure sample of CO ( Carbon monoxide ) ?

What is dry ice ? Why is it called so ? How to prepare a pure sample o

1.	What is dry ice ? Why is it called so ? How to prepare a pure sample of CO ( Carbon monoxide ) ?
Answer» Solution :Solid `CO_(2)` is called DRY ice.It is called dry ice because it directly changes into GASEOUS state without becoming liquid. `"HCOOH" underset (373 K) OVERSET ("Conc" H_(2)SO_(4)) (rarr) CO+H_(2) O.`