Prelims 2023

Q40. With reference to green hydrogen, consider the following statements:

1. It can be used directly as a fuel for internal combustion.
2. It can be blended with natural gas and used as fuel for heat or power generation.
3. It can be used in the hydrogen fuel cell to run vehicles.

How many of the above statements are correct?
a. Only one
b. Only two
c. All three
d. None

Question from UPSC Prelims 2023 GS Paper

Explanation : 

Correct Answer – c. All three

Understanding Green Hydrogen

Green hydrogen refers to hydrogen produced through the electrolysis of water using electricity generated from renewable sources like solar, wind, or hydroelectric power. This process results in zero greenhouse gas emissions, making green hydrogen an environmentally friendly alternative to fossil fuels.

1. Direct Use as Fuel for Internal Combustion

Green hydrogen can be used directly as a fuel in internal combustion engines. This means that it can be burned in these engines, similar to natural gas. While not as common as hydrogen fuel cells for vehicles, this method provides an alternative option for utilizing green hydrogen.

2. Blending with Natural Gas for Heat or Power Generation

Another use of green hydrogen is blending it with natural gas to create a fuel mixture known as hythane. This hythane blend can then be used for heat or power generation, providing a cleaner energy source compared to using natural gas alone.

3. Fueling Vehicles with Hydrogen Fuel Cells

One of the most prominent uses of green hydrogen is in fuel cells for vehicles. Hydrogen fuel cells generate electricity through a chemical reaction between hydrogen and oxygen, with water being the only byproduct. This makes it an environmentally friendly energy source for powering electric vehicles.

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