\[Z{{n}^{2+}}+2{{e}^{}}\xrightarrow{{}}Zn(s)\] \[\,0.762\] |
\[C{{r}^{3+}}(aq)+3{{e}^{}}\xrightarrow{{}}Cr(s)\] \[\,0.740\] |
\[2{{H}^{+}}(aq)+2{{e}^{}}\xrightarrow{{}}{{H}_{2}}(g)\] \[0.00\] |
\[F{{e}^{3+}}(aq)+3{{e}^{}}\xrightarrow{{}}Fe(aq)\] \[+\,0.770\] |
A) Zn (s)
B) H (s)
C) Cr (s)
D) Fe (s)
Correct Answer: A
Solution :
\[Z{{n}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Zn;\] \[{{E}^{o}}=-\,0.762\] |
\[C{{r}^{3+}}+3{{e}^{-}}\xrightarrow{{}}Cr;\] \[{{E}^{o}}=-\,0.740\] |
\[2{{H}^{+}}+2{{e}^{-}}\xrightarrow{{}}{{H}_{2}};\] \[{{E}^{o}}=0.00\] |
\[F{{e}^{3+}}+3{{e}^{-}}\xrightarrow{{}}Fe;\] \[{{E}^{o}}=+0.770\] |
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