is NH4 Lewis acid or Lewis base :
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No. A lewis acid is a chemical specie in which one of the atom requires a lone pair of electron in order to get a stable electronic configuration. In NH4+, all atoms are in stable electronic configuration and hence it isn't a lewis acid. It is a weak Lewis acid as it's conjugate base is a good Lewis base...
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NH4+ is neither a Lewis Base nor a Lewis acid because it does have any available lone pair of Electrons to donate so that it can said to be a lewis base, but also because it's octet is complete it doesn't have enough vacancy to accept any electron pair from other Lewis base, which means that it cannot be called a Lewis acid too ! ^_^
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