SAT Subject Test Chemistry,10 edition

Questions   58–59   refer   to  the following   experimental    data.

Half Reaction Eo

I. Mg → Mg2+ + 2e– 2.37 V

II. Mn → Mn2+ + 2e– 1.03 V

III. H 2 → 2H+ + 2e– 0.00 V

IV. Cu → Cu2+ + 2e– –0.16 V

(A) An  excited state   Ca  atom

(B) A   ground  state   Ca  atom

(C) An  excited state   Sc  atom

(D) An  excited state   K   atom

(E) None    of  the above

58 .    Which   of  the following   reactions   is  spontaneous?

(A) Mn2+    +   H 2     →

(B) Mg  +   Mn2+    →

(C) Mg2+    +   Mn  →

(D) Cu  +   2H+ –   →

(E) Mg2+    +   Cu  →

59 .    What    will    be  the standard    reduction   potential   for the reaction    in  the answer  to  question

58?

(A) –0.16   V

(B) –1.34   V

(C) 1.03    V

(D) 1.34    V

(E) 2.21    V