Question

Zn gives hydrogen with $H_{2}SO_{4}$ and HCl but not with $HNO_{3}$ because

• A. Zn acts as oxidizing agent when reacts with $HNO_{3}$
• B. $HNO_{3}$ is weaker acid than $H_{2}SO_{4}$ and HCl
• C. Zn is above the hydrogen in electrochemical series
• D. $NO_{3}^{-}$ is reduced in preference to $H^{+}ion$

Answer 1

Answer: (D)

$NO_{3}^{-}$ is reduced in preference to $H^{+}ion$

Answer 2

Due to reduction of $NO_{3}^{-}$ in preference to $H^{+}$ion, $H^{+}$ ion is not reduced to give $H_{2}$ gas.