Question

The reaction of zinc with dilute and concentrated nitric acid respectively, produces:

• A. $N{O}_2$ and $NO$
• B. $NO$ and $N_{2}O$
• C. $N{O}_2$ and $N_{2}O$
• D. $N_{2}O$ and $N{O}_2$

Answer 1

The correct option is D $N_{2}O$ and $N{O}_2$

$Zn$ reacts with conc. $HN{O}_3$ to form nitrogen dioxide:
$Zn+\underset{conc.}{4HN{O}_3}\to Zn(N{O}_3{)}_2+2H_{2}O+2N{O}_2\uparrow$

$Zn$ reacts with dil. $HN{O}_3$ to form nitrous oxide:
$4Zn+\underset{dil.}{10HN{O}_3}\to 4Zn(N{O}_3{)}_2+5H_{2}O+N_{2}O\uparrow$