Which of the following statements is correct concerning the testing of an R-22 refrigeration system for leaks in an enclosed compartment with a halide torch?

Correct Answer: Option C — Halide torches are useful in locating very small R-22 leaks.

Halide torches detect halogenated refrigerants like R-22 by drawing air over a hot copper element; the flame color shifts to green or bright blue in the presence of refrigerant vapor, making them exceptionally sensitive for locating small leaks.