Problem: Which of the following reagents would oxidize Cr to Cr2+, but not Pb to Pb2+? a) Br- b) Co2+ c) Ca2+ d) Br2 e) Ca f) Co

FREE Expert Solution

If the E°cell is lower, then E°cell of Cr and Pb can be reduced/cannot be oxidized. 

Cr/Cr2+  → E°cell = -0.26 V

Pb/Pb2+  → E°cell = -0.913 V


Inspecting the choices:

Br-, Ca and Co are reduced form so these cannot be OA anymore


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Problem Details

Which of the following reagents would oxidize Cr to Cr2+, but not Pb to Pb2+

a) Br

b) Co2+ 

c) Ca2+ 

d) Br

e) Ca 

f) Co

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