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NEET 2002
Exam
NEET
Year
2002
Subject
Chemistry
Chapter
d and f Block Elements

NEET 2002 · Chemistry · d and f Block Elements

Zn gives H_2 gas with H_2 SO_4 and HCl but not with HNO_3 because:

Zn\mathrm{Zn} gives H2\mathrm{H}_2 gas with H2SO4\mathrm{H}_2 \mathrm{SO}_4 and HCl\mathrm{HCl} but not with HNO3\mathrm{HNO}_3 because:

Options

  1. AZn\mathrm{Zn} acts as an oxidizing agent when reacts with HNO3\mathrm{HNO}_3
  2. BHNO3\mathrm{HNO}_3 is weaker acid than H2SO4\mathrm{H}_2 \mathrm{SO}_4 and HCl\mathrm{HCl}
  3. Cin electrochemical series Zn\mathrm{Zn} is above hydrogen
  4. DNO3−\mathrm{NO}_3^{-}is reduced in preference to hydronium ion

Correct answer

D. NO3−\mathrm{NO}_3^{-}is reduced in preference to hydronium ion

Step-by-step solution

Nitric acid (HNO3)\left(\mathrm{HNO}_3\right) is a strong oxidising agent. The Hydrogen gas produced during its reaction with metal gets oxidised to H2O\mathrm{H}_2 \mathrm{O}, hence no hydrogen gas is produced. Usually when Zn\mathrm{Zn} reacts with acid, it acts as a reducing agent which gets oxidised to a salt and the acid is the oxidising agent which gets reduced to hydrogen gas.
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