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Complexes formed in the following methods are :
(I) Mond's process for purification of nickel
\( \mathrm{P} \)
(II) Removal of unreacted \( \mathrm{AgBr} \) from photographic plate
W
(III) Removal of lead poisoning from the body
(a) \( \mathrm{Ni}_{4} \)
II
\( \left[\mathrm{Ag}(\mathrm{CN})_{2}\right]^{-} \)
\( \left[\mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}\right]^{3-} \)
\( \left[\mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}\right]^{3-} \)
\( \left[\mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)\right]^{-} \)
III
(b) \( \mathrm{Ni}(\mathrm{CO})_{4} \)
\( [\mathrm{Pb}(\mathrm{EDTA})]^{2-} \)
(c) \( \mathrm{Ni}(\mathrm{CO})_{6} \)
\( [\mathrm{Pb}(\mathrm{EDTA})]^{2-} \)
(d) \( \mathrm{Ni}(\mathrm{CO})_{6} \)
\( [\mathrm{Pb}(\mathrm{EDTA})]^{4-} \)
\( [\mathrm{Pb}(\mathrm{EDTA})]^{2-} \)
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