Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system

In an ammonia absorption refrigeration system, the cycle includes four major processes: evaporation, absorption, generation, and condensation.

The absorber is the part where the system gives up heat to the surroundings.

In the absorber, ammonia vapour coming from the evaporator is absorbed into a weak ammonia solution (water + less ammonia), forming a strong solution.

This absorption is exothermic — it releases heat. That heat must be rejected to the surroundings, often via cooling water.

So, the correct description of where heat is released is: from ammonia vapours to the weak solution — which is exactly what Option D says.

Let’s now address the confusion:

Option B: "Weak solution to strong solution" — This describes the chemical result of the absorption, not the direction of heat flow. The solution becomes strong by absorbing ammonia, but this does not describe the process of heat transfer. It’s chemically correct but thermodynamically incomplete.

Option A: "Strong solution to weak solution" — This is incorrect. There is no heat given up by a strong solution to a weak one in the process.

Option C: "Strong solution to ammonia vapour" — This describes part of the generation process, which requires heat input, not heat rejection.

Therefore, the only option that directly and clearly identifies where the system gives up heat is:

Option D: Ammonia vapours to weak solution.