Answer:
The answer is "Base".
Step-by-step explanation:
Given equation:
In the above-given chemical equation, the
is the lewis base which is used to donate an electron pair to the central atom of
to form
.
It is any substance like the
ion which might give a pair of non-bound electrons. Hence, it is an electron-pair donor. Throughout the theory of Lewis acid is an ion or molecule which accepts a pair of nonbonding electrons of value, that's why the base is the correct answer.