NEET Solved Paper 2018 Question 2
Question: Which one of the following elements is unable to form $ MF_6^{\text{3-}}ion $ ? [NEET - 2018]
Options:
A) B
B) Al
C) Ga
D) In
Show Answer
Answer:
Correct Answer: A
Solution:
$ \because $ ‘B’ has no vacant d-orbitals in its valence shell,
so it can’t extend its covalency beyond 4.
i.e. ‘B’ cannot form the ion like
$ MF_6^{\text{3(-)}} $ i.e. $ BF_6^{3(-)} $ .
Hence, the correct option is [a].
