Below is shows the phase dingrm ofode the following questions 73- atm CO Co-(s) 5.11 atm coo) atm -- -78.5-564 31.1 Temperature °C 12. Point X is called the A) Triple Point B) Critical Point C)Boilling Point Dsublimation Point 13. Which is more dense, solid or liquid carbon dioxide? A) Solid B) Liquid C) Can\'t be Determined 14.Surface pressure on Planet X is 5.3 atm and temperature varies between -80°C and 30-C. What phases of carbon dioside can exist on the surface of Planet X7 A) solid, liquid, gas B) solid, liquid idgas D) solid, gas E)cannot be determined 15.The phase diagram of carbon dioxide was determined on earth. Bow the temperatures would be different B) the pressures would be difflerent both temperatures and pressures would be different D) mo diffierences would it be different if it was determined on Mars Solution Ans 12 : A) Triple point The point X is called as the triple point in the phase diagram. It is the point in the phase diagram in which all three physical states of the substance solid , liquid and gas coexist in the equillibrium. For water it is at 0.01 o C. .