Answers

2016-05-07T11:47:21+05:30
Dry ice is nothing but solid CO2 so its chemical formulae will also be the sameĀ 
CO2
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2016-05-07T11:51:30+05:30
Dry ice is nothing but simply solidified carbon dioxide.So its chemical formula would be CO2.It is called so because it appears similar to ice and is infact colder than ordinary ice.It is mainly used as a cooling agent due to this property.It is used for preserving frozen foods , ice cream , etc.
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