JEE Main 2025 Jan 29 Shift 2, Chemistry Q18: Periodicity In Atomic Properties

JEE Main2025Jan 29, Shift 2Chemistry

The type of oxide formed by the element among Li, Na, Be, Mg, B and Al that has the least atomic radius is :

A
$A_{2} O_{3}$
B
$A O_{2}$
C
$A O$
D
$A_{2} O$

Solution

Among the six elements, atomic radius decreases across a period and increases down a group. The smallest radius belongs to boron (period 2, group 13).

Boron forms boron trioxide, $B_{2} O_{3}$ , which fits the formula $A_{2} O_{3}$ .

$∴$ The required oxide type is $A_{2} O_{3}$ .

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JEE Main 2025 Jan 29 Shift 2, Chemistry Q18: Periodicity In Atomic Properties

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