The reaction of Zinc (Zn) with dilute HNO_ 3 and concentrated HNO_ 3 produces different nitrogen oxides. Identify the gases produced in each case respectively.

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EEJ MAIN Chemistry QUESTION #7152

Question 1

The reaction of Zinc ($Zn$) with dilute $HNO_{3}$ and concentrated $HNO_{3}$ produces different nitrogen oxides. Identify the gases produced in each case respectively.

$NO_{2}$ and $NO$
$NO$ and $N_{2}O$
$NO_{2}$ and $N_{2}O$
$N_{2}O$ and $NO_{2}$✔️

Correct Answer Explanation

Zinc reacts with nitric acid in varying concentrations:

With dilute $HNO_{3}$: $4Zn + 10HNO_{3} \rightarrow 4Zn(NO_{3})_{2} + 5H_{2}O + N_{2}O$ (Nitrous oxide)
With concentrated $HNO_{3}$: $Zn + 4HNO_{3} \rightarrow Zn(NO_{3})_{2} + 2H_{2}O + 2NO_{2}$ (Nitrogen dioxide)

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