Q. Which of the following pairs is/are correctly matched?
1. Grey Hydrogen – Coal Brown Hydrogen – Natural Gas
2. Pink Hydrogen – Electrolysis via nuclear power
Select the correct answer from the codes given below:

[A] 1 only

[B] 2 and 3 only

[C] 3 only

[D] 1 and 2 only

Answer: C
Notes:
  • Grey Hydrogen: This is the most common form of hydrogen production. Grey hydrogen is created from natural gas, or methane, using steam methane reformation but without capturing the greenhouse gases made in the process. 
  • Brown hydrogen: Using black coal or lignite (brown coal) in the hydrogen-making process, these black and brown hydrogen are the absolute opposite of green hydrogen in the hydrogen spectrum and the most environmentally damaging. 
  • Pink hydrogen: Pink hydrogen is generated through electrolysis powered by nuclear energy. Nuclear-produced hydrogen can also be referred to as purple hydrogen or red hydrogen. In addition, the very high temperatures from nuclear reactors could be used in other hydrogen productions by producing steam for more efficient electrolysis or fossil gas-based steam methane reforming. 

Source: Article