First slide

Important polymers, structures & applications

Question

By definition “X” is not an alkaline earth metal. Hydride of “X” cannot be prepared by direct combination with hydrogen. “X” renders passive with concentrated ${HNO}_{3}$ . Nature of Oxide of “X” is

Easy

A

Acidic
B

Amphoteric
C

Neutral
D

Basic

Solution

“BeO” is amphoteric, other oxides of $2^{nd}$ group are basic. ∴ By definition “Be” cannot be called as alkaline earth metal;
${BeH}_{2}$ cannot be prepared directly;
“Be” renders passive with concentrated ${HNO}_{3}$ due to the formation of oxide layer;

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