Q. With reference to Hydrogen, consider the statements below:
1. Grey hydrogen is produced from coal.
2. Hydrogen is a good storage material for surplus electricity generated from renewables.
Which of the statements given above is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: B
Notes:
  • Statement 1 is incorrect: Grey hydrogen is produced from methane or natural gas. Brown hydrogen is produced from coal. 
  • Statement 2 is correct: Apart from use in transportation, hydrogen may be a good storage material for surplus electricity generated from renewables. Solar and wind are intermittent; sometimes they don’t generate any power, and sometimes they generate a surplus. The surplus can be used to electrolyze hydrogen, which can be stored. 

Source: Article