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The oxidation number is changed in which of the
P following case for \( \mathrm{Cr} \)

W
(1) \( \mathrm{SO}_{2} \) gas is passed into \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} / \mathrm{H}^{+} \)
(2) Aqueous solution of \( \mathrm{CrO}_{4}^{2-} \) is acidified
(3) \( \mathrm{CrO}_{2} \mathrm{Cl}_{2} \) is dissolved in \( \mathrm{NaOH} \)
(4) \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \) solution is made alkaline
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