Step 1: Understand the matching task. We must match each colloid in List I with its correct use in List II. These are standard uses of colloids in industry and medicine.
Step 2: Match smoke. Smoke is a colloid of charged carbon particles in air. It is cleaned using a Cottrell precipitator, which removes the charged particles. So smoke goes with the Cottrell precipitator.
Step 3: Match silver sol. Colloidal silver, sold as Argyrol, is used as an eye lotion. So silver sol goes with eye lotion.
Step 4: Match antimony colloid. Colloidal antimony is used to treat the disease Kala-azar. So antimony colloid goes with Kala-azar.
Step 5: Match gold sol. Colloidal gold is used for intramuscular injections to help with joint problems. So gold sol goes with intramuscular injection.
Step 6: Write the full match. Putting it together gives A with III, B with I, C with II, D with IV. \[ \boxed{A\text{-}III,\ B\text{-}I,\ C\text{-}II,\ D\text{-}IV} \]
