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Copper metal will react with concentrated trioxonitrate (V) acid to give?

Chemistry
WAEC 1993

Copper metal will react with concentrated trioxonitrate (V) acid to give?

  • A. Cu(NO3)3 + NO + N2O4 + H2O
  • B. Cu(NO3)2 + NO + H2O
  • C. CuO + NO2 + H2O
  • D. Cu(NO3)2 + 2NO2 + 2H2O
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Correct Answer: Option D
Explanation

Generally, when metals react with acids, Hydrogen gas is usually liberated, with an exception of dilute Trioxonitrate(V) acids. However, in this case, it is not the usual Acid- metal reaction, as Copper metal is reacting with concentrated nitric acid. Thus, Copper is oxidized by the concentrated nitric acid, HNO3, to produce Cu2+ ions while the nitric acid is reduced to nitrogen dioxide, NO2 and water is also formed. Therefore, the correct answer is option D.

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