Very pure hydrogen (99.9%) can be made by which of the following processes

Very pure hydrogen (99.9%) can be made by which of the following processes?

  1. Reaction of salt like hydrides with water
  2. Reaction of methane with steam
  3. Mixing natural hydrocarbons of high molecular weight
  4. Electrolysis of water

Answer

Highly pure hydrogen is obtained by the electrolysis of water. Electrolysis of water is the decomposition of water (H2O) into oxygen (O2) and hydrogen gas (H2) due to an electric current being passed through the water.

The correct option is D.