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AP EAMCET202125 Aug 2021Morning ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Which of the following metals produces hydrogen gas on reacting with cold dilute nitric acid?

Options

  1. AAl
  2. BFe
  3. CMg
  4. DCu

Correct answer

C. Mg

Step-by-step solution

Both magnesium ( Mg ) and manganese ( Mn ) react with very dilute cold HNO ₃ to evolve H ₂ gas. Magnesium metal reacts with dilute nitric acid to form magnesium nitrate and hydrogen gas Mg + array c Cold and dilute array 2 HNO ₃ array c Magnesium nitrate array Mg ( NO ₃ )₂ + H ₂(g) Hydrogen gas is not evolved when other metals react with nitric acid because it is a strong oxidising agents. It oxidises hydrogen produced to water and itself gets reduced to nitrogen oxide.

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