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How many `H^(+)` ions are required when the equation below is balanced with the smallest whole number coefficients?
`Cu(s)+NO+_(3)^(-)` (aq) `+H^(+)` (aq) `rarrCu^(2+)` (aq) `+NO(g)+H_(2)O(l)`
A. 2
B. 4
C. 6
D. 8

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