Chemical depilatories remove unwanted hair by:

Chemical depilatories are designed to remove unwanted hair by using specific chemicals that break down the protein structure of the hair. This process effectively dissolves the hair, allowing it to be easily wiped or washed away from the skin. The active ingredients in these depilatories, often such as calcium thioglycolate or sodium thioglycolate, target the keratin in hair, weakening its structure. As a result, the hair becomes soft and can be easily removed without damaging the skin.

The other options do not accurately describe the mechanism of chemical depilatories. For instance, the notion of burning the hair implies a damaging and destructive process, while shrinking the hair suggests a size alteration which does not accurately reflect the chemical action at play. Similarly, turning hair to liquid is not technically correct as the process involves breaking it down into its components rather than converting it into a liquid form.