Hypochlorous is a weak acid, so it is present in water as HClO(aq). Ammonia reacts by synthesis (or formation of ammonium as a proton acceptor base) rather than by double displacement like hydroxide bases:
NH3(aq) + HClO(aq) → NH4ClO(aq) (All ammonium salts are soluble is a usual rule)
NH3(aq) + HClO(aq) → NH4+(aq) + ClO-(aq) (net ionic form)
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