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Q.

Why is solid carbon dioxide called dry ice?

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a

When heated it changes into liquid   

b

When heated it does not change to gas   

c

When heated it does not change to liquid but directly changes into gas.   

d

When heated no changes occurs 

answer is C.

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Detailed Solution

Due to the fact that solid CO2 does not melt into a liquid when heated but instead transforms instantly into gas, it is referred to as dry ice. Sublimation is the name of this procedure.
 
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Why is solid carbon dioxide called dry ice?