1. In the balanced oxidation-reduction reaction (occurring in acidic condition) the coefficients before H+ and Zn2+

Question

are ____ and ____, respectively?
Zn + NO3¯ → NH4+ + Zn2+ (unbalanced)

A. 4, 2
B. 4, 1
C. 6, 1
D. 10, 4
E. 12, 2

Answer 1

Anything you need to know about balancing redox equations is here.
http://www.chemteam.info/Redox/Redox.html

In this equation, Zn goes from zero to +2. N goes from +5 to -3.