Answer
a) $K^+, OH^-$
b) $2\ K^+, SO_4^{2-}$
c) $Li^+, NO_3^-$
d) $2\ NH_4^+, SO_4^{2-}$
Work Step by Step
This problem requires familiarization with common ions:
a) $K^+, OH^-$
b) $2\ K^+, SO_4^{2-}$
c) $Li^+, NO_3^-$
d) $2\ NH_4^+, SO_4^{2-}$