Hydrogen gas would be a plentiful and non-polluting fuel source, were it readily
ID: 715093 • Letter: H
Question
Hydrogen gas would be a plentiful and non-polluting fuel source, were it readily created through the electrolysis of water. Why isn't this currently being done on a commercial scale? Select one: a. The resulting byproduct of the electrolysis is ozone (O3), a lung irritant. b.It is being done, but it is only being used in the 3 countries which are outside the influence of the major oil corporations c It would be used freely if the energy required to create the products from water weren't so high O d. Hydrogen gas escapes into space from our atmosphere because the Earth's gravitational pull is not strong enough to hold it. Which of the following elements cannot be used in p-doping Select one: a. B b. Ga . d.AIExplanation / Answer
1)To get H2 for fuel source, we would have to dissociate it from Hydrocarbons or water molecules. (water in this case of the question)Doing so would take all of the energy and more than we could get back since the energy released from burning H2 with a oxidizer to H2O (water) produces as much energy as it takes to dissociate water into its base components H2 and O2.
In other words, it takes energy to produce hydrogen from water and the energy it would release as a fuel is less than what it would take to make it(from electrolysis of water).
Therefore,the correct option is -:
(c)It would be used freely if the energy required to create the products from water weren't so high.
2)For the p-type doping,element must be doped with third group element in the periodic table.
Since,p type means excess of holes,therefore,third group has one electron deficient as compared to fourth group element,so they are perfect for producing holes(empty space of electrons with same mass and opposite charge).
Out of the following options B,Al,Ga belong to third group ,so they are apt for p-type doping.
So, the element which cannot be used for p-type doping is P(as it doesn't belong to third group,moreover, it belong to fifth group which is excess of electrons so good for n-type doping)
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