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metals and non-metals — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Sciencemetals and non-metals1 Mark
Question
Which metal does not release hydrogen gas with nitric acid? Why?
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Answer

  • Hydrogen gas is not released when aluminium $(Al)$ and chromium $(Cr)$ react with nitric acid, because nitric acid $\left(\mathrm{HNO}_3\right)$ is a strong oxidising agent.
  • It oxidises the $\mathrm{H}_2$ produced to water and itself gets reduced to any of the nitrogen oxides $\left(\mathrm{N}_2 \mathrm{O}, \mathrm{NO}\right.$ or $\left.\mathrm{NO}_2\right)$.

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