What is the standard e.m.f. for a voltaic cell based on the reactions:
Sn4+ (aq) + 2e– → Sn2+ (aq) E ̊red = +0.154 V
Cr3+ (aq) + 3e– → Cr (s) E ̊red = –0.74 V
a) +1.94 V
b) +0.89 V
c) +2.53 V
d) –0.59 V
e) –1.02 V
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