| (i) According to a convention cell potential of hydrogen electrode (S.H.E.) is considered to be zero at all temperatures. |
| (ii) e.m.f. of the cell \[Pt(s)/{{H}_{2}}(g,1\,\,bar)/{{H}^{+}}(aq,1M)||Z{{n}^{2+}}(aq,1M)/Zn\] is \[-0.76\]This negative value indicates that \[Z{{n}^{2+}}\]ion reduces less easily then \[{{H}^{+}}\] ions. |
| (iii) Copper does not dissolve in HCl but dissolves in \[HN{{O}_{3}}\] as in nitric acid it gets oxidised by nitrate ion. |
| (iv) Inert metals like Pt or Au are used in certain electrodes i.e., these metals does not participate in reaction but provide surface for oxidation and reduction reactions. |
| (v) Fluorine has the highest electrode potential thereby making it strongest oxidising agent whereas lithium with lowest electrode potential is the weakest oxidising and strongest reducing agent. |
| Which of the following are the correct statements above? |
A) (iv) and (v)
B) (i), (ii) and (iv)
C) (iii), (iv) and (v)
D) All are correct
Correct Answer: D
Solution :
[d] All statements given above are correct.
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