Question

Which of the following reactions will occur spontaneously as written?

3Fe (s) + 2Cr³⁺ (aq) ? 2Cr (s) + 3Fe²⁺ (aq)

Sn⁴⁺ (aq) + Fe²⁺ (aq) ? Sn²⁺ (aq) + Fe (s)

Sn⁴⁺ (aq) + Fe³⁺ (aq) ? Sn²⁺ (aq) + Fe²⁺ (aq)

3Sn⁴⁺ (aq) + 2Cr (s) ? 2Cr³⁺ (aq) + 3Sn²⁺ (aq)

3Fe²⁺ (aq) ? Fe (s) + 2Fe³⁺ (aq)

Half-reaction Cr+ (aq) 3e (s) 0.74 Fe2+ (aq) 2e Fe (s) -0.440 Fe3+ (aq) e Fe2 (s) +0.771 Snt+ (aq) 2e- Sn2+ (aq) l +0.154