Brine Solution:
A brine solution is a concentrated solution of salt (sodium chloride) in water. It is commonly used in various industrial processes and has several applications due to its unique properties.

Uses of Brine Solution:
1. Food Preservation: Brine solution is commonly used for the preservation of food items like pickles, olives, and cheese.
2. Deicing Agent: Brine solution is an effective deicing agent to melt ice and snow on roads, highways, and runways during winter.
3. Water Softening: It is used in water softening systems to remove hardness-causing minerals from water.
4. Chemical Industry: Brine solution serves as a raw material for the production of various chemicals such as chlorine, caustic soda, and hydrogen gas.

Preparation of Highly Pure H2 from Brine Solution:
1. Electrolysis: The most common method for the preparation of hydrogen gas (H2) from brine solution is through the process of electrolysis. Here is a step-by-step explanation of the process:

- Electrolysis Setup: A brine solution is placed in an electrolytic cell that consists of two electrodes – an anode and a cathode.
- Passing Electric Current: Direct current (DC) is passed through the brine solution, causing the electrolysis process to occur.
- Electrolysis Process: At the anode, chloride ions (Cl-) are oxidized to form chlorine gas (Cl2). At the cathode, water molecules (H2O) are reduced to form hydrogen gas (H2) and hydroxide ions (OH-).
- Separation of Gases: The produced gases (chlorine and hydrogen) are collected separately. To obtain highly pure hydrogen gas, it needs to be further purified by removing any traces of chlorine or other impurities.
- Purification: Various purification techniques like scrubbing, drying, and filtering are employed to remove impurities from the hydrogen gas. This ensures the production of highly pure hydrogen gas.

2. Alternative Methods: Apart from electrolysis, there are other methods to obtain hydrogen gas from brine solution, such as using chemical reactions or biological processes. However, electrolysis is the most commonly used method due to its efficiency and effectiveness.

In summary, brine solution is a concentrated salt solution with various uses in food preservation, deicing, water softening, and chemical production. Highly pure hydrogen gas can be obtained from brine solution through the process of electrolysis, where chloride ions are oxidized to form chlorine gas at the anode, and water molecules are reduced to form pure hydrogen gas at the cathode. The produced hydrogen gas can be further purified to remove any impurities before it can be used for various applications.