Question

all bases/alkalies have a positively charged metallic ion, except ammonium hydroxide {NH4OH} which has positive charged NH4 radicle . Explain

Answer 1

When we talk about alkalis, hydroxides immediately spring to mind. Sodium hydroxide, potassium hydroxide are fantastic examples of alkalis. However, hydroxides (OH-) due to the nature of having a negative charge almost always carry with them a metallic cation. Put down your hand, ammonium hydroxide. I will get to you soon.

So we have to look for a compound that can produce OH- in water and yet does not contain any metal ions. Based on what I can infer from your level, aqueous ammonia is probably your your candidate for such an alkali.