Give the uses of freon 12, DDT, carbon tetrachloride and iodoform.
Freon 12 is widely used for aerosol propellants, refrigeration, and air conditioning. Carbon tetrachloride is used in the manufacture of refrigerants and propellants, as a feedstock for chlorofluorocarbons, in pharmaceutical manufacturing, and as a general solvent. Historically, it was also used as a cleaning fluid (degreasing agent and spot remover) and as a fire extinguisher.
Iodoform was previously used as an antiseptic; its antiseptic properties are due to the liberation of free iodine. However, due to its objectionable smell, it has been replaced by other iodine formulations. The provided text does not mention the uses of DDT.
Explanation
The answer is derived strictly from the provided text sections 6.8.3, 6.8.4, and 6.8.5. Freon 12 is identified as a common freon used for propellants and refrigeration. Carbon tetrachloride's uses are listed extensively, ranging from refrigerant manufacture to cleaning and fire extinction. Iodoform's use as an antiseptic is noted, along with the reason for its obsolescence (smell). Note that while DDT is listed as a heading (6.8.6), the provided context cuts off before describing its uses, so it is omitted from the specific uses list in the answer.
Solution Steps
Step 1: Identify uses of Freon 12 from the text (aerosol propellants, refrigeration, air conditioning).
Step 2: Identify uses of Carbon tetrachloride from the text (refrigerants, propellants, feedstock, pharmaceuticals, solvent, cleaning fluid, fire extinguisher).
Step 3: Identify uses of Iodoform from the text (antiseptic due to iodine liberation).
Step 4: Check for DDT uses in the text; note that only the heading is provided without descriptive text.