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JEE Main levelSingle correct optionDifficulty 2 of 3pt012

Which property is shared by beryllium and aluminium, an example of diagonal relationship?

ABoth form amphoteric oxides
BBoth react vigorously with cold water
CBoth form strongly basic hydroxides
DBoth form mainly ionic chlorides

Answer: A

BeO and

Al X_{2} O X_{3}

are both amphoteric. Neither Be nor Al reacts with cold water because of a protective oxide film, their hydroxides are amphoteric not strongly basic, and

BeCl X_{2}

and

AlCl X_{3}

are largely covalent.

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