Question

Assertion:Boron can only form `[BF_(4)]^(-)`,whereas aluminium forms`[AIF_(6)]^(3-)`.
Reason:Ionization enthalpy increases across a period.
A. If both assertion and reason is the correct explanation of assertion.
B. If both assertion and reason is the correct explanation of assertion.
C. If both assertion and reason is the correct explanation of assertion.
D. If both assertion and reason is the correct explanation of assertion.

Answer 1

Correct Answer - B
The maximum covalency of first member of each group of s-andp-block elements is 4,(due to non-availability of d-orbitals)Whereas the other member can expand their valence shell to accommodate more than four pairs of electrons (due to availability of d-orbitals).