Which one of the following is applied on wounds as an antiseptic? 

Iodine 

The correct answer is option 1. Iodine.

Out of the options listed, Iodine is commonly applied on wounds as an antiseptic.

Here's why the other options are not suitable antiseptics for wounds:

Chlorine: While chlorine can be used as a disinfectant for surfaces or water treatment, it's too harsh for direct application on wounds due to its irritating nature.

Bromine: Similar to chlorine, bromine is not suitable for wound antiseptics because it can cause tissue damage.

Calcium: Calcium is a mineral essential for the body but not an antiseptic. It doesn't fight microorganisms that can cause infection in wounds.

Iodine is a common antiseptic used to kill bacteria and other microorganisms that can cause infection in wounds. It is available in various forms, such as tinctures or solutions, for topical application. However, it's important to note that concentrated iodine can irritate the skin and should be used according to a doctor's instructions or diluted as recommended.