Final answer:
No precipitation reaction occurs when solutions of ammonium chloride and calcium nitrate are mixed, as all resulting ions remain soluble in the solution (Option B).
Step-by-step explanation:
The student seeks to identify the correct precipitation reaction when mixing solutions of ammonium chloride and calcium nitrate. According to solubility rules, all nitrates are soluble in water.
Since ammonium chloride (NH₄Cl) and calcium nitrate (Ca(NO₃)₂) will dissociate into soluble ions in solution, specifically NH₄₊, Cl−, Ca₂₊, and NO₃₋, no precipitation reaction occurs.
The potential new combinations of ions (NH₄NO₃, CaCl₂) are also soluble according to the rules.
Thus, every ion remains in the solution as an ion and does not form a solid compound.
Therefore, there is no net ionic equation, and the correct choice is Option (B) No reaction occurs.