Question

The correct statements among (a) to (d) regarding ${H_2}$ as a fuel are:
a) It produces less pollutants than petrol.
b)A cylinder of compressed hydrogen weighs $\sim 30$ times more than a petrol tank producing the same amount of energy.
c)Dihydrogen is stored in tanks of metal alloys like $NaN{i_5}$
d)On combustion, values of energy released per gram of liquid Hydrogen and LPG are ${\text{50}}$ and $142{\text{ kJ}}$, respectively
A. b and d only
B. a, b and c only
C. b, c and d only
D. a and c only

Answer 1

The question is about selecting the correct statements about the hydrogen gas fuel. So in order to solve these types of questions, one should analyze the given options carefully and select the correct choice.

Complete step by step answer:
- First of all let's analyze the given options one by one. The first statement states that ${H_2}$ as a fuel produces fewer pollutants than petrol which is true as hydrogen fuel is zero-emission fuel.
-The second statement which states that the weight of a cylinder of compressed hydrogen is $\sim 30$ times more than a petrol tank which produces the same amount of energy which is also a true statement as hydrogen gas has a higher calorific value.
-The third statement states that the hydrogen is stored in tanks of metal alloys like $NaN{i_5}$ is true as to store the hydrogen gas metal tanks are used widely.
- The fourth statement states that the combustion values of energy released per gram of liquid hydrogen and LPG are ${\text{50}}$ and $142{\text{ kJ}}$ respectively which is incorrect as LPG produces less energy than liquid hydrogen.
- Therefore, the statements a, b, and c are correct which shows option B as the correct choice.

Note: Hydrogen fuel can be used in fuel cells or internal combustion engines of commercial fuel vehicles such as passenger cars. The hydrogen fuel is also used in spacecraft propulsion as a fuel. The majority of hydrogen is made by using fossil fuels by the steam reforming process. The hydrogen fuel is a zero-emission fuel that is burned in presence of oxygen which means it produces fewer pollutants in the atmosphere.