MolSynapsequestion bank

MolSynapse / Question bank / s-Block Elements / Anomalous behaviour of Li and Be, diagonal relationship

JEE Main levelSingle correct optionDifficulty 2 of 3sb068

When beryllium metal is warmed with aqueous sodium hydroxide, the observation and result are

Ano reaction occurs because beryllium is passivated by the alkali
Bhydrogen is evolved and insoluble beryllium hydroxide stays as a residue
Chydrogen is evolved and a soluble beryllate species is formed
Dammonia is evolved and beryllium oxide is formed

Answer: C

Like aluminium, beryllium is amphoteric:

Be + 2 NaOH + 2 H X_{2} O Na X_{2} [Be (OH) X_{4}] + H X_{2}

. Hydrogen is evolved and the beryllate dissolves; Mg does not react in this way.

Practice s-Block Elements More on Anomalous behaviour of Li and Be, diagonal relationship

Previous questionNext question

More questions on Anomalous behaviour of Li and Be, diagonal relationship