$Be$ and $Al$ exhibit many properties which are similar, but the two elements differ in :
When aqueous solution of borax is acidified with hydrochloric acid, a white crystalline solid is formed which is soapy to touch. Is this solid acidic or basic in nature ? Explain.
Which match is not incorrect ?
The Lewis acid nature of $BX_3$ follows the order
$AlC{l_3}$ is