62) What chemical agent would be most destructive to Nylon? a) water b) alkalai

ID: 930147 • Letter: 6

Question

62) What chemical agent would be most destructive to Nylon?

a) water

b) alkalai caustic (draino)

c) sulfuric acid

d) ethanol

63) Which plastic should never be used around ammonia or amines?

a) polyacetal (delrin)

b) polycarbonate (Lexan)

c) polymethyl methacrylate (Lucite)

d) polystyrene (Styrol)

64) Aluminum doesn’t readily corrode because:

a) its standard reduction potential is more positive than oxygen

b) its standard reduction potential is more negative than oxygen

c) it forms a dense coating of alumina, Al2O3, that slows oxidation.

d) It is already oxidized.

Please answer all of them without guessing!!! Thanks

62) Answer is "C"

because in prsence of acid nylon underoges hydrolysis

63) Answer is "B"

because it dissolves in ammonia and acetone

64) Answer is "C"

i.e. it forms a dense coating of alumina, Al2O3, that slows oxidation

Because Al2O3 is tightly packed that no more oxygen can react with other aluminium. The oxide layer acts as a protective film over the metal.

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