Chemistry Written Test Questions and Answers for Class 11 on “Dihydrogen as a Fuel”.
1. Absorption of hydrogen on a metal surface is known as __________
a) adsorption
b) occlusion
c) absorption
d) emission
Answer: b
Clarification: Occlusion is nothing but the absorption of hydrogen at a metal surface which is a primary cause of reduction, hydrogenation, etc. As the temperature increases, occlusion decreases i.e. they are dependent on each other.
2. In a hydrogen molecule, when the spins are in the same direction. What is it known as?
a) adsorbent hydrogen
b) nascent hydrogen
c) parahydrogen
d) ortho hydrogen
Answer: d
Clarification: When in the hydrogen molecule, the nucleus spins are in the same direction, it is known as orthohydrogen. When the spins are in the opposite direction, it is known as parahydrogen. At room temperature hydrogen consists of 75% ortho and 25% para hydrogens.
3. What is freshly prepared hydrogen known as?
a) nascent hydrogen
b) atomic hydrogen
c) parahydrogen
d) absorbed hydrogen
Answer: a
Clarification: Nascent hydrogen is the hydrogen is freshly obtained from a chemical reaction and is more reactive than normal hydrogen comparatively as it is not stable. The activity of nascent hydrogen depends upon the reaction by which, it is obtained.
4. What is the problem that arises with hydrogen as a fuel?
a) storage
b) production
c) process
d) availability
Answer: a
Clarification: The production of hydrogen is very easy and its process is also simple because the availability is enormous in the atmosphere as well as in the form of water, but the problem comes in the storage because we need to store hydrogen in a high-pressure tank or in a cryogenic tank.
5. Is liquid hydrogen fuel dangerous?
a) yes
b) no
c) may be
d) may not be
Answer: a
Clarification: Yes, hydrogen fuel is dangerous as it has low ignition energy and high combustion energy. It tends to leak easily from tanks, this is a reason for many explosions at hydrogen fuel manufacturing or storing centers.
6. Can dihydrogen be used as a Fuel?
a) yes
b) no
c) may be
d) cannot say
Answer: a
Clarification: Yes, dihydrogen can be used as a fuel and the process of usage of liquid hydrogen as an alternate source of energy is given by the term hydrogen economy. In the near future, there is a possibility of using liquid hydrogen as a fuel.
7. What do you think the hydrogen economy involves?
a) transfer
b) production
c) implementation
d) process
Answer: b
Clarification: Hydrogen economy is a technology that involves production, transportation, and storage of energy in the form of liquid hydrogen as it is an alternate source of energy, there are many ways in which hydrogen can be used as fuel.
8. Hydrogen is stored in an alloy.
a) true
b) false
Answer: a
Clarification: The storage of hydrogen in liquid form can be done in vacuum insulated cryogenic tanks or in a metal or in an alloy like Iron Titanium alloy such as interstitial hydride. Hence, the above statement is true.
9. What can photo hydrogen obtain?
a) rotational energy
b) wind energy
c) renewable energy
d) water energy
Answer: c
Clarification: Photohydrogen as used to obtain renewable energy from sunlight. This can be possible by using microscopic organisms such as bacteria or algae. This is also a form of obtaining energy through hydrogen.
10. How can we produce a large scale of hydrogen?
a) titration
b) by electrolysis
c) hydrogenation
d) storage
Answer: c
Clarification: Large scale production of hydrogen can be done by electrolysis of water or by thermochemical reaction cycle. Hydrogen fuel has many advantages over conventional fuels that it is nonpolluting and it liberates a large amount of energy on combustion.
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