Answer:
Air in a refrigeration system causes All of the above problems.
Step-by-step explanation:
The acid build up is basically seen when the circuit system comes in contact with air, moisture, more heat, various contaminants and also various impurities which enhances the chemical reaction helps in making of acid. Moisture is found when the warm air comes in contact with the cooling system inside the refrigerator. It basically occurs if the defrost condition not working properly. Copper plating is the compressors metal parts that has been coated with the copper when this comes in contact with air leads to corrosion.