Which of the following pairs comprise the red precipitates? (a) \( \mathrm{Ag}_{2} \mathrm{CrO}_...

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Which of the following pairs comprise the red precipitates?
(a) \( \mathrm{Ag}_{2} \mathrm{CrO}_{4} \) and \( \mathrm{Hg}_{2} \mathrm{CrO}_{4} \) (b) \( \mathrm{HgI}_{2} \) and \( \mathrm{Ni}(\mathrm{dmg})_{2} \)
(c) \( \mathrm{BiOI} \) and \( \mathrm{Cu}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right](d) \) Both \( (a) \) and \( (b) \)
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