In the context of proposals to the use of hydrogen-enriched CNG (H-CNG) as fuel for buses in public transport, consider the following statements: 1. The main advantage of the use of H-CNG is the elimination of carbon monoxide emissions. 2. H-CNG as fuel reduces carbon dioxide and hydrocarbon emissions. 3. Hydrogen up to one-fifth by volume can be blended with CNG as fuel for buses. 4. H-CNG makes the fuel less expensive than CNG. Which of the statements given above is / are correct?

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UPSC Question: In the context of proposals to the use of hydrogen-enriched ...

In the context of proposals to the use of hydrogen-enriched CNG (H-CNG) as fuel for buses in public transport, consider the following statements:

The main advantage of the use of H-CNG is the elimination of carbon monoxide emissions.
H-CNG as fuel reduces carbon dioxide and hydrocarbon emissions.
Hydrogen up to one-fifth by volume can be blended with CNG as fuel for buses.
H-CNG makes the fuel less expensive than CNG.

Which of the statements given above is / are correct?