Question

Hydrogen is a cleaner fuel than $CNG$
$A.$ True
$B.$ False

Answer 1

Hydrogen and $CNG$ are used as fuel. $CNG$ is compressed natural gas. With natural gas mainly composed of methane, $CNG$ emit less pollutant that is carbon dioxide, carbon monoxide and particulate matter whereas hydrogen fuel is a zero-emission fuel burned with oxygen

Complete step by step answer:
Hydrogen fuel is a cleaner fuel than $CNG$ . This is due to when hydrogen fuel is burnt it produces only water as a side product whereas $CNG$ on burning produces many air pollutants such as Carbon dioxide, that is greenhouse gas responsible for increasing atmospheric temperature known as global warming.
Thus, we can say that hydrogen fuel is a cleaner fuel than $CNG$ on the basis of side product production.
So, the correct option is $A$ .

Additional Information
Hydrogen fuel is used mainly in transport. Some of these uses are;
Power source for vehicles such as cars, trucks, buses and even boats.
Power source for spacecraft, remote weather station and batteries for electronics such as laptop and Smartphone.
Hydrogen fuel is also used as rocket fuel due to its more efficiency
Uses of $CNG$ fuel: $CNG$ is primarily used as a fuel for buses and trucks that return to base for refueling on a regular basis. $CNG$ is also used as a fuel for cars. $CNG$ Vehicle needs to be refueled using purpose built compressors that are connected to a mains supply of natural gas.

Note:
Except $CNG$ and hydrogen fuel there is a gas is known as $LPG$ which has many use in following sector: $LPG$ is commercially used as cooking fuel, it is also used for welding and cutting purpose and in industry it used such as manufacture of petrochemicals and electricity generation