11. Stainless steel is less susceptible to rusting than iron because ________ A.

Question

11. Stainless steel is less susceptible to rusting than iron because ________

A. the carbon within the alloy polymerizes to form a protective film.

B. the silicon within the alloy oxidizes to form a protective silicate layer.

C. it is coated with plastic.

D. the intermetallic compound formed is less reactive.

E. the metals other than iron in the alloy form protective oxides.

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14. A rock salt structure has smaller ions in ________

A. hexagonal holes.

B. octahedral holes.

C. cubic holes.

D. tetrahedral holes.

E. the usual atomic positions in the unit cell, i.e., not in holes.

Explanation / Answer

13] Stainless steel is less susceptible to rusting than iron because

E. the metals other than iron in the alloy form protective oxides.

Mainly chromium reacts with oxygen and forms a protective layer

14]

Rocksalt = NaCl = FCC

Smaller ions - Cations fills in the octahedral sites of FCC

So asnwer is B

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