Which of the following compounds is used as the starting material f...

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Which of the following compounds is used as the starting material for the preparation of potassium
\( \mathrm{P} \) dichromate?
(1) \( \mathrm{K}_{2} \mathrm{SO}_{4} \cdot \mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3} \cdot 24 \mathrm{H}_{2} \mathrm{O} \) (chrome alum)
W
(2) \( \mathrm{PbCrO}_{4} \) (chrome yellow)
(3) \( \mathrm{FeCr}_{2} \mathrm{O}_{4} \) (chromite)
(4) \( \mathrm{PbCrO}_{4} \cdot \mathrm{PbO} \) (chrome red)
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