how would you separate these two part mixtures ASAP!?!?!?!?

Question

a. lead fillings and iron fillings
b. sand and gravel
c. sand and finely ground plastic foam
d. salt and sugar
e. alcohol and water
f. nitrogen and oxygen

Answer 1

a. use a magnet to remove the iron
b. use a metallic mesh around 2-3 mm to let the sand go through
c. throw in water. plastic will float.
d. Use a nanofiltration membrane with a molecular weight cutoff of 200 and diafilter the salt out.
e. distillation. Add benzene to overcome the pinch point if you need pure water and pure alcohol separation.
f. Cooling the mixture.

Answer 2

iron is ferromagnetic; lead is not
sand is much smaller than gravel; how about using a fine-mesh sieve?
Plastic has a density less than that of water.
d.You can get the chloride out by adding silver nitrate or lead nitrate and precipitating the chloride of the heavy metal
e. You can heat the alcohol-water mixture to fractionate out the alcohol, that has a boiling T much less than 100 degrees C, but there is a limit
f. Cool it and fractionate; the boiling points are different

Answer 3

a Magnet
B. fine mesh sieve
c. Water...Plastic floats
d. Magnifying glass
e. distillation
f boiling point