When acidified \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) solution is added to \( \math...

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When acidified \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) solution is added to \( \mathrm{Sn}^{2+} \) salts then \( \mathrm{Sn}^{2+} \) changes to
(a) \( \mathrm{Sn} \)
(b) \( \mathrm{Sn}^{3+} \)
(c) \( \mathrm{Sn}^{4+} \)
(d) \( \mathrm{Sn}^{+} \)
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