Question

On heating,_______ changes into carbon dioxide gas without becoming liquid.

Answer 1

(1)When liquid ${\mathrm{CO}}_2$ is cooled to $-78°\mathrm{C}$,under normal pressure,it changes into a snow-white solid,called dry ice.

(2)Dry ice,directly changes into gaseous carbon dioxide,from its solid state,i.e.,without passing through its liquid state.This is because dry ice is a sublimable substance.It has a cooling effect.

Therefore,on heating,dry ice changes into carbon dioxide gas without becoming liquid