Question
When nitric acid HNO3 reacts with metals, hydrogen gas is not observed because
Answer: Option B
:
B
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B
Most of the metals do not react with HNO3 because it is a strong oxidizing agent.
Since hydrogen is a reducing agent, nitric acid oxidises the hydrogen produced to water and itself undergoes reduction to give N2O, NO, NO2, N2 and NH3.
Hence, when metals (except Mn and Mg) are treated with nitric acid, hydrogen gas is not liberated.
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