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Dihydrogen fuel - class-XI

Description: dihydrogen fuel
Number of Questions: 15
Created by:
Tags: chemistry hydrogen and its compounds non-metals hydrogen elements of group 1 and group 2
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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


Correct Option: C
Explanation:

Hydrogen blow torch is based on high calorific value of  $H _2$.


Hence the correct option is C.

Which of the following statements are not true for hydrogen?

  1. It exists as diatomic molecule

  2. It has one electron in the outermost shell

  3. It can lose an electron to form a carbon which can freely exist

  4. It forms a large number of ionic compounds by losing an electron


Correct Option: C,D
Explanation:

The electronic configuration of the Hydrogen atom is $1s^1$.

It has one electron in the outermost shell. It exists as a diatomic molecule $(H _2)$ by sharing its' electron with other hydrogen atom.

It cannot form ionic compounds because it cannot donate its' electron and can only form covalent compounds by sharing the electron. It cannot lose an electron to form a cation because the hydrogen atom cannot exist after losing an electron.

Dalda (Vanaspathi) is prepared by:

  1. hydrogenation of triolien

  2. hydrogenation of soap

  3. hydrogenation of tristearine

  4. electrolysis of potassium acetate


Correct Option: A
Explanation:

Dalda (Vanaspathi) is prepared by hydrogenation of triolien.

In which of the following way, the transportation of hydrogen gas do not take place?

  1. Liquid

  2. Gas

  3. Compressed gas

  4. Pressurized gas


Correct Option: B
Explanation:

The transportation of hydrogen gas is done in heavy metal cylinders and it can also be transported in liquid form. In order to transport large amounts of hydrogen it must be either pressurized and delivered as a compressed gas, or liquefied.

$H _2$ is best alternative to fossil fuels but use of hydrogen as a fuel is dangerous because:

  1. it is chemically unstable.

  2. the storage of $H _2$ is very risky and can causes explosion.

  3. it is very expensive.

  4. it causes the corrosion of containers in which it is present


Correct Option: B
Explanation:

$H _2$ is best alternative to fossil fuels but use of hydrogen as a fuel is dangerous because the storage of $H _2$ is very risky and causes explosion because of low ignition energy.

In hydrogen economy, energy required for automobiles or electrical energy is obtained from the reaction between _____ and oxygen.

  1. hydrogen

  2. oxygen

  3. silver

  4. none of these


Correct Option: A
Explanation:

In hydrogen economy, energy required for automobiles or electrical energy is obtained from the reaction between hydrogen and oxygen.
This eliminates the use of carbon based fossil fuels. It reduces emission of carbon dioxide gas. Hydrogen acts as energy carrier as a substitute for petroleum reserves that are in short supply.

Hydrogen can be prepared on commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of $CO$ and $H _2$ gas is formed called:

  1. water gas

  2. syngas

  3. producer gas

  4. industrial gas


Correct Option: A
Explanation:

Mixture of $CO$ and ${ H } _{ 2 }$ is called water gas. As the mixture of $CO$, $CO _2$ and ${ H } _{ 2 }$ is used for the synthesis of methanol and a no. of hydrocarbon, it is also called synthesis gas or 'syngas'.

The by-product formed in most of the cases with the use of hydrogen is:

  1. water.

  2. oxygen

  3. carbon-dioxide

  4. none of above


Correct Option: A
Explanation:

Hydrogen is attractive because whether it is burned to produce heat or reacted with air in a fuel cell to produce electricity, the only byproduct is water.

Which of the following gas is used in fuel cell?

  1. Carbon-dioxide

  2. Hydrogen

  3. Sulphur dioxide

  4. Chlorine


Correct Option: B
Explanation:

In the fuel cell, Chemical energy is converted to Electrical energy.Hydrogen and oxygen gases are used in fuel cell along with water, heat.

The best alternative to fossil fuels will be ______.

  1. Coal

  2. Animal fat

  3. Hydrogen

  4. Gasoline


Correct Option: C
Explanation:

$H _2$ gas is environmentally clean gas and gives off water on combustion. It causes no harm to the environment and hence the best alternative for fossil fuels.

Which of the following has highest calorific value?

  1. Animal fat

  2. Hydrogen gas

  3. Gasoline

  4. Coal


Correct Option: B
Explanation:

Animal fat: 38kJ/g
Coal: 29.3kJ/g
Hydrogen gas: 142kJ/g
Gasoline: 48kJ/g

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


Correct Option: D
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.

How many atoms of oxygen are present in the compound $ K _4Al _2 (SO _4) _3.24H _2O? $

  1. 40

  2. 36

  3. 32

  4. 31


Correct Option: B

Hydrogen gas is:

  1. has high molecular weight.

  2. a medium for storage of energy

  3. excellent fuel

  4. both B and C


Correct Option: D
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.

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


Correct Option: C
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).

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