Q.2.-Which of the following compounds includes and element with an oxidation number of +5?
a) ClO4- b) MnO4- c) NO2- d) SO32- e) NO3-
Q.3.- Which of the following metals does NOT react with water to produce hydrogen?
a) Zn b) Li c) Ca d) Na e) K
Q.4.- The standard voltage, E˚, is 0.68V for the cell: In| In+3 || Cu+2| Cu
Find the standard reduction potential for the reaction: In+3 + 3e- à In
a) 0.34V b) –0.34V c) 1.02V d) –1.02V e) 0.00V
Q.5.- Given the following information, which of the statements is true?
Cu2+ (aq) + e- à Cu+(aq) E˚red= 0.34V
2H+(aq) + 2e- à H2(g) E˚red= 0.0V
Fe+2(aq) + 2e- à Fe(s) E˚red= -0.44V
Ni(s) à Ni+2(aq) + 2e- E˚red= 0.25V
a) Cu+2(aq) is the strongest oxidizing agent
b) Cu+2(aq) is the weakest oxidizing agent
c) Ni(s) is the strongest oxidizing agent
d) Fe(s) would be the weakest reducing agent
e) H+(aq) would be the strongest oxidizing agent
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