20. Dry ice is the solid form of : A.Air B.Carbon dioxide C.Nitrogen D.Water
Answer: Option B Solution: Dry ice, carbon dioxide in its solid form, a dense, snow like substance that sublimes (passes directly into the vapour without melting) at −78.5 °C (−109.3 °F), used as a refrigerant, especially during shipping of perishable products such as meats or ice cream.
