A) \[S{{n}^{2+}}\xrightarrow{{}}S{{n}^{4+}}+2{{e}^{-}}\]
B) \[A{{g}^{+}}+\,\,{{e}^{-}}\xrightarrow{{}}Ag\]
C) \[Zn\xrightarrow{{}}Z{{n}^{2+}}+2{{e}^{-}}\]
D) \[2O{{H}^{-}}\xrightarrow{{}}{{H}_{2}}O+\frac{1}{2}{{O}_{2}}+2{{e}^{-}}\]
Correct Answer: B
Solution :
Key Idea Reduction occurs at cathode. Oxidation occurs at anode. A chemical change during which an atom or ion loses electrons is called oxidation. While a chemical change in which an atom or ion gains electrons is called reduction. \[S{{n}^{2+}}\xrightarrow{{}}S{{n}^{4+}}+2{{e}^{-}}\] Oxidation takes place. \[A{{g}^{+}}+{{e}^{-}}\xrightarrow{{}}Ag\] Reduction takes place. \[Zn\xrightarrow{{}}Z{{n}^{2+}}+2{{e}^{-}}\] Oxidation takes place \[2O{{H}^{-}}\xrightarrow{{}}{{H}_{2}}O+\frac{1}{2}{{O}_{2}}+2{{e}^{-}}\] Oxidation takes place. In the reaction reduction takes place. Therefore, this reaction occurs at the cathode while in reactions , and oxidation takes place. So, these reactions occur at anode.
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