21. Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of NO3-and Sn2+ in the balanced reaction?  ??−3NO3− (aq) + Sn2+(aq) → Sn4+(aq) + NO(g) A) ??−3NO3− = 3,           Sn2+ = 2 B) ??−3NO3− = 2,           Sn2+ = 3 C) ??−3NO3− = 4,           Sn2+ = 9 D) ??−3NO3− = 1,           Sn2+ = 1 E) ??−3NO3− = 3,           Sn2+ = 5

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