Answer
a. Physical property
b. Chemical property
c. Physical property
d. Physical property
e. Chemical property
Work Step by Step
a. Chlorine gas liquefies at -$35^{0}$C. This statement describes a physical property of chlorine. The chlorine gas is liquefied thus it changes its form of the matter from gas to liquid, but it retains its chemical identity.
b. Hydrogen burns in chlorine gas. This is a chemical property as in the process of burning hydrogen gas do not retain its chemical property but it is transformed.
c. Bromine melts at $-7^{0}$C. This is a physical property as bromine changes its form from solid to liquid, but it retains its chemical identity.
d. This is a physical property as it describes the color and hardness of lithium.
e. Iron rusts in an atmosphere of moist air. This statement describes a chemical change that happens to iron when it is in contact with the moist (water vapor) of the air. Iron is transformed into iron rust, thus it doesn’t retain its chemical identity.