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Balance the coefficients x and y in the redox reaction: x*HI + y*HNO3 -> NO + I2 + H2O
- x = 3, y = 2
- x = 2, y = 3
- x = 6, y = 2
- x = 6, y = 1
Correct answer: x = 6, y = 2
Solution
I^(-1) loses 1 electron to form I2 (0), and N^(+5) gains 3 electrons to form NO (+2). For 6 electrons exchanged: 6HI provides 6I⁻ (-> 3I2) and 2HNO3 provides 2N^+5 (-> 2NO), giving x=6, y=2.
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