Question

Content attribution

Answer 1

The given question is incomplete. The complete question is :

Which anion would bond with K+ in a 1: 1 ratio to form a neutral ionic compound?​

a) $O^{2-}$

b)  $F^{-}$

c)  $N^{3-}$

d)  $S^{2-}$

Answer: b)  $F^{-}$

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here potassium is having an oxidation state of +1 called as  cation and thus is an anion must have an oxidation state of -1 if they have to combine in 1: 1 ratio to  give neutral ionic compound.

Thus the anion has to be $F^-$ which combines with $K^+$ in 1: 1 ratio to give $KF$