When \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) is convert...

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When \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) is converted into \( \mathrm{K}_{2} \mathrm{CrO}_{4} \), the
P change in oxidation number of \( \mathrm{Cr} \) is

W
(1) 0
(2) 6
(3) 4
(4) 3
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