JEE Main · 2016 · 03 Apr 2016 · Offline · p-Block Elements

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

(A) $NO_{2}$ and NO
(B)NO and $N_{2} O$
(C) $NO_{2}$ and $N_{2} O$
(D) $N_{2} O$ and $NO_{2}$ ✓ Correct

Answer: (D)

Solution

The more dilute the nitric acid, the more deeply the nitrogen is reduced. Dilute acid is reduced right down to nitrous oxide,

4 Zn + 10 HNO X_{3} 4 Zn (NO X_{3}) X_{2} + N X_{2} O + 5 H X_{2} O

. Concentrated acid, a stronger oxidiser, is reduced only to nitrogen dioxide,

Zn + 4 HNO X_{3} Zn (NO X_{3}) X_{2} + 2 NO X_{2} + 2 H X_{2} O

. So dilute acid gives

N X_{2} O

and concentrated acid gives

NO X_{2}

JEE Main · 2016 · 03 Apr 2016 · Offline · Single correct option

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