Answer:
Options b, d and e are chemical properties.
Explanation:
Chemical properties are those related to the formation of new compounds whereas physical properties refer to intrinsic characteristics in which the substance does not change its identity but it can change its state of matter.
From the options, the chemical properties are:
b. Iron powder dissolves in an acidic solution with the evolution of a gas
Because it refers to the ability of iron to react with acid and to form another compound- a gas.
d. Iron forms complexes with molecular oxygen in proteins like hemoglobin and myoglobin
Because it refers to the ability of iron to form new compounds - complexes with oxygen.
e. Iron rusts readily in moist air
Because it is related to the ability of iron to be oxydized by oxygen in the moist air, so it refers to the formation of new compounds.
