Uses of Hydrogen

Q.

Which of the following reasons cause the limited use of H₂ as a fuel?

I) Its calorific value is low.
II) Its availability in free state is less.
III) It is difficult to store.
IV) It is not a clean fuel.

1. II, III and IV

2. I, II and III

3. II and III

4. I and III

Q. In fuel cells ______ is converted into electrical energy

1. Potential energy
2. Neutralization energy
3. Thermal energy
4. Kinetic energy

Q. Sort the following sources of hydrogen gas according to the percent of hydrogen gas contributed by them.

1. Petrochemicals
2. Coal
3. Electrolysis
4. Other sources

Q. In which of the following industrial methods or processes, hydrogen gas is used?

1. Fuel cells
2. Production of methanol
3. Reduction of metal oxides into metal
4. Hydrochloric acid production

Q.

What do you understand by the terms:
(A). hydrogen economy

(B). Hydrogenation

(C). Syngas

(D). water-gas shift reaction

(E). fuel-cell

Q.

How does the atomic hydrogen torch function for cutting and welding purposes? Explain.

Q. Describe the industrial use of hydrogen which depends on its ability to react with vegetable oil in the presence of a catalyst.

Q. Ordinary hydrogen at room temperature is a mixture of_________.

1. $75\%$ $o$-Hydrogen + $25\%$ $p$-Hydrogen
2. $25\%$ $o$-Hydrogen + $75\%$ $p$-Hydrogen
3. $50\%$ $o$-Hydrogen + $50\%$ $p$-Hydrogen
4. $1\%$ $o$-Hydrogen + $99\%$ $p$-Hydrogen

Q. Hydrogen blow torch is based on :

1. short bond length of $H_2$
2. high bond energy of $H_2$
3. high calorific value of $H_2$
4. least molecular weight

Q. Give reasons for the following:
Though hydrogen is lighter than air, it cannot be collected by downward displacement of air.