Beryllium shows different properties from rest of the alkaline earth metals because of its small atomic and ionic size, high electronegativity and hig
Beryllium shows different properties from rest of the alkaline earth metals because of its small atomic and ionic size, high electronegativity and high polarising power.But beryllium shows similarities in properties to the second member of the next group i.e. aluminium on account of similar atomic and ionic size and nearly same polarising power
Which of the following statements is true ?
A. BeO and `Be(OH)_2` both are purely basic in nature
B. Be can expand its covalency to six
C. Be largely forms covalent compounds which get easily hydrolysed
D. Be combines with hydrogen upon heating to form `BeH_2`
1 Answers
Correct Answer - C
(A)BeO and `Be(OH)_2` are amphoteric in nature.
(B)Be cannot expand its covalency greater than four as it does not have vacant d-orbitals.
(C ) Correct statement, on account of high ionisation enthalphy and small size.
(D)Do not combine directly with `H_2` on heating to form hydride. ltbr Method used is: `2BeCl_2 + LiAlH_4 to 2BeH_2 + LiCl+AlCl_3`