Tag: introduction to hydrogen

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Multiple choice chemistry non-metals dihydrogen fuel dihydrogen as a fuel introduction to hydrogen

The usage of dihydrogen is:

  1. It acts a a fuel cell

  2. Energy is distributed in the form of dihydrogen

  3. It is economical fuel

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dihydrogen fuel is a zero-emission fuel when burned with oxygen (if one considers water not as an emission) or used in a contained cell. The energy released enables hydrogen to act as a fuel. In an electrochemical cell, that energy can be used with relatively high efficiency.

Multiple choice chemistry non-metals dihydrogen fuel dihydrogen as a fuel introduction to hydrogen

Hydrogen gas is:

  1. has high molecular weight.

  2. a medium for storage of energy

  3. excellent fuel

  4. both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hydrogen is not found in pure form on Earth, however, so it must be produced from other compounds such as natural gas, biomass, alcohols or water. In all cases it takes energy to convert these into pure hydrogen. For that reason, hydrogen is really an energy carrier or storage medium rather than an energy source in itself.

Multiple choice chemistry non-metals dihydrogen fuel dihydrogen as a fuel introduction to hydrogen

Basic principle of hydrogen economy is:

  1. transportation of energy in the form of liquid or gaseous dihydrogen

  2. storage of energy in the form of liquid or gaseous dihydrogen
  3. both $A$ and $B$

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The usage of hydrogen as a low-carbon energy source, such as gasoline as a transport fuel, it is referred to as "Hydrogen economy". The basic principles of Hydrogen economy are:-

(i) Storage of energy in the form of liquid or gaseous dihydrogen.
(ii) transportation of energy in the form of liquid or gaseous dihydrogen.
Thus the answer is both (A) and (B).

Multiple choice chemistry study of the first element - hydrogen occurrence of hydrogen introduction to hydrogen hydrogen

Metals like .......... , ........... and .......... give $H _2$ with steam.

  1. iron

  2. magnesium

  3. aluminium

  4. sodium

  5. calcium

  6. none of the above
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Metals which react with steam to give $H _2$ gas are Iron, Magnesium and Aluminium.


Magnesium ribbon reacts with steam to give Magnesium oxide and Hydrogen gas.

$Mg$ $+$ $H _2O$ $=$ $MgO$ $+$ $H _2$

Aluminium reacts with steam to give Aluminium Oxide and Hydrogen gas. But the reaction takes place very slowly, as a layer of Aluminium Oxide forms on the metal.

$2Al$ $+$ $3H _2O$ $=$ $Al _2O _3$ $+$ $3H _2$
Iron does not react with cold water. It reacts with steam to form Ferric Oxide and hydrogen gas.

$3Fe$ $+$ $4H _2O$ $=$ $Fe _3O _4$ $+$ $4H _2$
Thus, options A, B  and C are correct.

Multiple choice chemistry study of the first element - hydrogen occurrence of hydrogen introduction to hydrogen hydrogen

At $298 \, K$ , assuming ideal behaviour, the average kinetic energy of a deuterium molecule is :

  1. Two times that of a hydrogen molecule

  2. Four times that of a hydrogen molecule

  3. Half of that of a hydrogen molecule

  4. Same as that of a hydrogen molecule
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Average Kinetic Energy depends only on temperature

$\displaystyle (KE) _{avg} = \frac {3kT} {2} $ per molecule