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Ammonium sulphate is made up o ammonia and sulphate.

Ammonia =NH4+ = cation

sulphate = SO4²- = anion.

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Ammonia = NH4+ cation sorry 
it's ammonia not Al ..correct it
it's ok :)
As we know the chemical formula of Ammonium sulfate (NH4)2SO4
so here cation = (NH4)+
anion = (SO4)-2
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