Question

write conjugate base and acid for NH3

Answer 1

A pair of the species which differ by a proton (H+) are known as conjugate acid base pairs.

Loss of a proton leads to a conjugate base.
So conjugate base for NH3 is NH2^-1

And gain of a proton leads to a conjugate acid.
So conjugate acid for NH3 is NH4^+1


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Answer 2

i think it is hydrogen nitrate