Which of the following are true statements about CO2 ?

Question

Which of the following are true statements about CO2 ?
a) The melting point of CO2 increases as pressure decreases
b) The critical point of CO2 occurs at 31oC and 73 atm
c) At −20oC and 12 atm CO2 is in the liquid state
d) At 20oC and 1 atm, solid CO2 will melt to liquid state
e) Above 31oC a pressure greater than 73 atm would condense CO2 to the liquid state

Answer 1

a) True

b) True

c) False

d) False

e) True