Question

why is dry ice called as carbon di oxide cube

and what is the temparature of dry ice

Answer 1

(i) Dry ice is basically solidified carbon dioxide.Thus it may also be called as carbon dioxide cube.
(ii) Unlike ordinary ice, dry ice does not melt into a liquid but changes directly into CO₂ gas, a phenomenon known as sublimation. It changes into gaseous state at and above -78.5 degree Celsius. Thus Solid dry ice exist below temperature of -78.5 degree Celsius