Vanadium can exhibit different oxidation states V ²⁺, V ³⁺, V ⁴⁺ , and V ⁵⁺ in solution. The standard reduction potentials (E^0 ) for the vanadium couples V ³⁺ / V ²⁺, V ⁴⁺ / V ³⁺ , and V ⁵⁺ / V ⁴⁺ are -0.25 volts, +0.337 volts and +1.00 vo

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Vanadium can exhibit different oxidation states V ²⁺, V ³⁺, V ⁴⁺ , and V ⁵⁺ in solution. The standard reduction potentials (E^0 ) for the vanadium couples V ³⁺ / V ²⁺, V ⁴⁺ / V ³⁺ , and V ⁵⁺ / V ⁴⁺ are -0.25 volts, +0.337 volts and +1.00 volts, respectively. A solution of ( NH ₄ )₃ VO ₄ in dilute HCl is treated with tin ( E^0 for the couple Sn ²⁺ / Sn is -0.14 volts). The oxidation state of vanadium in the final solu

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Correct answer: C. +3

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