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Column-I and Column-II contains four entries each. Entries of Column-I are to be matched with some entries of Column-II. One or more than one entries of Column-I may have the matching with
\( \mathrm{P} \) the same entries of Column-II

W
(A) \( \mathrm{Pt} \mid \mathrm{Fe}^{3+}, \mathrm{Fe}^{2+} \)
(P) Metal-metal ion half-cell
(B) \( \mathrm{Pt}\left|\mathrm{H}_{2}\right| \mathrm{H}^{+} \)
(Q) Gas-gas ion half-cell
(C) \( \mathrm{Pt}|\mathrm{Hg}| \mathrm{Hg}_{2}^{2+} \)
(R) Oxidation-reduction half-cell
(D) \( \mathrm{Pb}\left|\mathrm{PbSO}_{4}\right| \mathrm{SO}_{4}^{2-} \)
(S) Metal-sparingly soluble salt half-cell
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