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When acidified solution of \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) is shaken with aqueous solution of \( \mathrm{FeSO}_{4} \), then :
\( \mathrm{P} \)
(1) \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \) ion is reduced to \( \mathrm{Cr}^{3+} \) ions
W
) \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \) ion is converted to \( \mathrm{CrO}_{4}^{2-} \) ions
(3) \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \) ion is reduced to \( \mathrm{Cr} \)
(4) \( \mathrm{Cr}_{2} \mathrm{O}_{7}{ }_{7}^{--} \)ion is converted to \( \mathrm{CrO}_{3} \)
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