When the following redox reaction is balanced and the coefficients are reduced t

Question

When the following redox reaction is balanced and the coefficients are reduced to their lowest whole-number terms, which statement is true? MnO4-(aq) + Sn2+(aq) MnO2(s) + SnO2(s) (acidic solution)

a. The coefficient on MnO4- is 1, and the coefficient on SnO2(s) is 3.

b. The coefficient on MnO4- is 3, and the coefficient on SnO2(s) is 2.

c. The coefficient on MnO4- is 2, and the coefficient on SnO2(s) is 3.

d. The coefficient on MnO4- is 2, and the coefficient on SnO2(s) is 1.

e. The coefficient on MnO4- is 1, and the coefficient on SnO2(s) is 2.

Explanation / Answer

MnO4-(aq) + Sn2+(aq) MnO2(s) + SnO2(s)

using oxidation number method :

oxidation reaction :

Sn+2 --->. Sn02 + 2e-

reduction reaction :

Mn04- + 3e- ----> Mn02

so the final equation will be

3 Sn+2 + 2 Mn04- ------> 3 Sn02 + 2 Mn02

so the answer is

c. The coefficient on MnO4- is 2, and the coefficient on SnO2(s) is 3

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