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Balancing Redox in Acidic

APCHEM-GXKI8Y

Consider the following unbalanced reaction that is occurring in acidic solution:

$$Cr_2O_7 \ ^{2-}+ NO_2 \ ^-→ Cr^{3+}+ NO_3 \ ^-$$

When the reaction is balanced, which of the following is the value of the coefficient for the nitrate ion?

A

1

B

2

C

3

D

4