Potassium iodide (KI) and strontium nitrate (Sr(NO3)2) do not react to form a new compound because the products of their interaction, potassium nitrate and strontium iodide, are both soluble, so no precipitate forms.
The question is asking about the combination of potassium iodide (KI) with strontium nitrate (Sr(NO3)2). To address the question directly: KI and Sr(NO3)2 do not form a compound together because they are both ionic salts that are soluble in water, and combining them does not result in a chemical reaction that produces an insoluble compound. Instead, they would remain in solution as separate ions.
As an example, when you mix potassium iodide (KI) with lead(II) nitrate (Pb(NO3)2), a chemical reaction occurs producing a precipitate due to the formation of lead(II) iodide (PbI2), as indicated by the reaction 2KI (aq) + Pb(NO3)2 (aq) → 2KNO3 (aq) + PbI2 (s). This happens because Pb2+ and I− ions have very strong attractive forces, resulting in a brilliant yellow precipitate.
However, in the case of KI and Sr(NO3)2, both potassium nitrate (KNO3) and strontium iodide (SrI2) that would hypothetically form are also soluble, so no precipitate would form, and therefore no visible chemical reaction would take place.