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D and F Block Elements question

2002 · Q103
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D and F Block Elements question

2002 · Q103

NEETChemistryD and F Block ElementsMCQ+4 / −1
Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because
  1. A
    Zn act as oxidising agent when react with HNO3
  2. B
    HNO3 is weaker acid than H2SO4 and HCl
  3. C
    In electrochemical series Zn is above hydrogen
  4. D
    NO3−_3^ -3−​ is reduced in preference to hydronium ion.
View written solutionFree

Correct answer: D

Zinc is on the top position of hydrogen in electrochemical series. So Zn displaces H2 from dilute H2SO4 and HCl with liberation of H2 .

Zn + H2SO4 →\to→ ZnSO4

  • H2

    On the other hand HNO3 is an oxidising agent. Hydrogen obtained in this reaction is converted into H2O.

    Zn + 2HNO3 →\to→ Zn(NO3 )2
  • 2H

    2HNO3 →\to→ H2O + 2NO2
  • O

    2H + O →\to→ H2O.
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