Question

why does nh3 acts as a lewis base

Answer 1

A lewis base is a species which can donate one or more electron pairs. NH3 acts as lewis base because it has a lone pair of electrons on nitrogen, which it can readily donate​.As shown in example given below:

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Answer 2

NITROGEN ATOM IN NH3 HAS ONE

LONE PAIR OF ELECTRONS WHICH

IS AVAILABLE FOR

DONATION.THEREFORE, IT

ACTS AS A LEWIS BASE.