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Question

Consider the following unbalanced reaction that is occurring in acidic solution:
Cr2O27+NO2Cr3++NO3
When the reaction is balanced, what is the coefficient on the nitrate ion?

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is B 3
Given : Cr2O27+NO2Cr3++NO3
Step 1: Cr2O27Cr3+ and HNO2NO3
Reduction Oxidation
Step 2:
a. Cr2O27Cr3+ and HNO2NO3
b. Cr2O27Cr3++7H2O and HNO2+H2ONO3
c. Cr2O27+14H+2Cr3++7H2O & HNO2+H2ONO3+3H+
d. 6e+Cr2O7+14H+2Cr3++7H2O&HNO2+H2ONO3+3H++2e
Step 3 : 6e+Cr2O7+14H+2Cr3++7H2O&3HNO2+3H2O2NO3+9H++6e
Adding both, Cr2O7(ag)+5H+(ag)+3HNO2(ag)2Cr3+(ag)+3NO3(ag)+4H2O(l)
Coefficient on the nitrate ion is 3.

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