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The size of the species, \( \mathrm{Pb}, \mathrm{Pb}^{2+}, \mathrm{Pb}^{4+} \) decreases as :
P
(a) \( \mathrm{Pb}^{4+}\mathrm{Pb}^{2+}\mathrm{Pb} \)
(b) \( \mathrm{Pb}\mathrm{Pb}^{2+}\mathrm{Pb}^{4+} \)
W
(c) \( \mathrm{Pb}\mathrm{Pb}^{4+}\mathrm{Pb}^{2+} \)
(d) \( \mathrm{Pb}^{4+}\mathrm{Pb}\mathrm{Pb}^{2+} \)
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