JEE Main · 2021 · 20 Jul 2021 · Shift 1 · p-Block Elements

Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and

P_{4} O_{10}

(in 4:1 ratio) is:

(A)basic
(B)neutral
(C)amphoteric
(D)acidic✓ Correct

Answer: (D)

Solution

Phosphorus(V) oxide is a powerful dehydrating agent and strips water from nitric acid:

4 HN O_{3} + P_{4} O_{10} ⟶ 4 HP O_{3} + 2 N_{2} O_{5}

The nitrogen oxide obtained is dinitrogen pentoxide, which is the anhydride of nitric acid and takes up water to regenerate

HN O_{3}

. An oxide that gives an oxyacid with water is acidic, so the chemical nature of this nitrogen oxide is acidic.

JEE Main · 2021 · 20 Jul 2021 · Shift 1 · Single correct option

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