JEE Main · 2020 · 09 Jan 2020 · Shift 1 · Classification of Elements and Periodicity

The acidic, basic and amphoteric oxides, respectively, are:

(A) $Cl_{2} O, CaO, P_{4} O_{10}$
(B) $MgO, Cl_{2} O, Al_{2} O_{3}$
(C) $Na_{2} O, SO_{3}, Al_{2} O_{3}$
(D) $N_{2} O_{3}, Li_{2} O, Al_{2} O_{3}$ ✓ Correct

Answer: (D)

Solution

Acidic oxides come from non-metals, basic oxides from metals and especially the s-block elements, and amphoteric oxides react either as acid or as base. The set

N_{2} O_{3}

, a non-metal oxide and so acidic,

L i_{2} O

, an alkali-metal oxide and so basic, and

A l_{2} O_{3}

, which is amphoteric, fills the three roles in exactly that order.

JEE Main · 2020 · 09 Jan 2020 · Shift 1 · Single correct option

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