Hydrogen Test

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Hydrogen Test - 3

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Question 1
1 / -0

Dihydrogen is used in fuel cells for generating electrical energy because

A
releases lesser energy per unit mass of fuel

B
does not produce any pollution

C
the surface tension is low

D
is rather unreactive at moderate temperatures

Solution

The fuel cell was invented in 1839 by Welsh lawyer Sir William Robert Grove. It takes in Hydrogen and Oxygen from the air and puts out electricity, heat, and water. It doesn't use fossil fuels and it doesn't produce greenhouse gases and so it should be the ideal solution to providing distributed or portable electrical power.
Question 2
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Dihydrogen under certain reaction conditions, combines with almost all elements to form binary compounds, called hydrides except with few which are given below Choose one of the options

A
transition elements

B
p-block elements

C
alkali metals

D
noble gases,

Solution

Noble gases are inert and have high ionisation enthalpy. Hence, they do not form any hydrides.
Question 3
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hydrogen compounds of non-metals are volatile compounds because

A
they are salt-like hydrides

B
they are non-stoichiometric hydrides

C
they are ionic

D
they are covalent

Solution

Covalent hydrides :They are formed when hydrogen molecule reacts with the p block elements. The most common examples, in this case, are CH₄ and NH₃. The hydrogen compounds formed with non-metals are also called hydrides. They are covalent and volatile compounds.
Question 4
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Most of the s-block elements form dihydrogen compounds which are:

A
neutral

B
highly electropositive

C
covalent

D
highly electronegative

Solution

Ionic hydrides are formed when hydrogen molecule reacts with most s-block elements which are highly electropositive in nature.

In solid state, the ionic hydrides are crystalline, non-conducting and non-volatile.

However, in liquid state it conducts electricity. Ionic hydrides on electrolysis liberate hydrogen gas at the anode.
Question 5
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The ionic hydrides are crystalline, non-volatile but on melting does one of the following:

A
liberates lithium at anode

B
conducts electricity

C
liberates dihydrogen gas at cathode

D
liberate water

Solution

They are formed when hydrogen molecule reacts with most s-block elements which are highly electropositive in nature. In solid state, the ionic hydrides are crystalline, non-conducting and non-volatile.

However, in liquid state it conducts electricity. Ionic hydrides on electrolysis liberate hydrogen gas at the anode.
Question 6
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Ammonia( NH₃) is an example of

A
electron-deficient compounds

B
electron-precise compounds

C
electron-rich hydrides

D
electron acceptors

Solution

Dihydrogen under certain reaction conditions combines with almost all elements except noble gases to form compounds called hydrides. Electron –rich hydrides, as the name suggest, are compounds of hydrogen with other elements that have excess electrons present as lone-pairs.

For example ammonia –NH₃ is a hydride of nitrogen that has one lone pair, water (H₂O) is a hydride of oxygen that has two lone pairs etc. As these are electron rich species, they can donate electrons that is they are lewis bases.
Question 7
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Many d-block and f-block elements form

A
saline hydride

B
covalent hydride

C
metallic hydride

D
ionic hydride

Solution

Hydrides are formed by many d-block and f-block elements when heated with hydrogen under pressure. The hydrides tend to be non-stoichiometric and they may be of variable composition.These hydrides have properties similar to those of parent metal and hence are known as metallic hydride.
Question 8
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Metal hydrides are used for hydrogen storage because

A
large volumes of hydrogen occupies interstices in the metal lattice

B
they are stoichiometric

C
they do not participate in any catalytic reactions

D
they do not conduct heat and electricity

Solution

Metal hydrides (MH_x) are the most technologically relevant class of hydrogen storage materials because they can be used in a range of applications including neutron moderation,electrochemical cycling, thermal storage, heat pumps, and purification/separation.

The metal hydrides such as intermetallic alloys and solid solutions have interstitial vacancies where atomic hydrogen is absorbed via an exothermic reaction; however, by endothermic path, the metal hydride desorbs the hydrogen reversibly at ambient to moderate temperatures.
Question 9
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Presence of extensive hydrogen bonding between water molecules is responsible for

A
liquid and vapour states

B
solid and vapour states

C
vapour states

D
liquid and solid states

Solution

strong attraction force of hydrogen bonding is responsible for liquid and solid states.

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Hydrogen Test - 3

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Hydrogen Test - 3

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SHARING IS CARING

Question 1

releases lesser energy per unit mass of fuel

does not produce any pollution

the surface tension is low

is rather unreactive at moderate temperatures

Solution

Question 2

transition elements

p-block elements

alkali metals

noble gases,

Solution

Question 3

they are salt-like hydrides

they are non-stoichiometric hydrides

they are ionic

they are covalent

Solution

Question 4

neutral

highly electropositive

covalent

highly electronegative

Solution

Question 5

liberates lithium at anode

conducts electricity

liberates dihydrogen gas at cathode

liberate water

Solution

Question 6

electron-deficient compounds

electron-precise compounds

electron-rich hydrides

electron acceptors

Solution

Question 7

saline hydride

covalent hydride

metallic hydride

ionic hydride

Solution

Question 8

large volumes of hydrogen occupies interstices in the metal lattice

they are stoichiometric

they do not participate in any catalytic reactions

they do not conduct heat and electricity

Solution

Question 9

liquid and vapour states

solid and vapour states

vapour states

liquid and solid states

Solution

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