Hydrogen Test

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Hydrogen Test - 1

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Question 1
1 / -0

The ionic hydrides are crystalline, non-volatile but on melting does one of the following:

A
liberate water

B
conducts electricity

C
liberates dihydrogen gas at cathode

D
liberates lithium at anode

Solution

Explanation:

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 2
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Most of the s-block elements form dihydrogen compounds which are:

A
highly electronegative

B
covalent

C
highly electropositive

D
neutral

Solution

Explanation:

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 3
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hydrogen compounds of non-metals are volatile compounds because

A
they are ionic

B
they are salt-like hydrides

C
they are non-stoichiometric hydrides

D
they are covalent

Solution

Explanation:

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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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
noble gases,

B
p-block elements

C
alkali metals

D
transition elements

Solution

Explanation:

Noble gases are inert and have high ionisation enthalpy. Hence, they do not form any hydrides.
Question 5
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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
is rather unreactive at moderate temperatures

D
the surface tension is low

Solution

Explanation:

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 6
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For the synthesis of methanol and a number of hydrocarbons , the compounds used are

A
mixture of CO andH₂

B
mixture of C, Zn and H₂

C
mixture of CO₂ and H₂

D
mixture of C and H₂

Solution

Explanation:

A mixture of CO and H₂in any ratio is called synthesis gas or syn gas as it is used in synthesis of methanol and a number of hydrocarbon.
Question 7
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Heavy hydrogen is also called

A
dihydrogen

B
protium

C
deuterium

D
tritium

Solution

Explanation:

Deuterium, (D, or ²H), also called heavy hydrogen, isotope of hydrogen with a nucleus consisting of one proton and one neutron, which is double the mass of the nucleus of ordinary hydrogen (one proton). Deuterium has an atomic weight of 2.014.
Question 8
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In the earth’s atmosphere, hydrogen exists in the form of

A
In the combined form with other elements and compounds

B
deuterium

C
tritium

D
protium

Solution

Explanation:

In the combined form it constitutes 15.4% of the earth crust and the ocean.
Question 9
1 / -0

The giant planets Jupiter and Saturn consist mostly of

A
nitrogen

B
oxygen

C
carbondioxide

D
hydrogen

Solution

Explanation:

The name ‘gas giant’ was coined in 1952 by science fiction writer James Blish to refer to all the giant planets. The giant planets (Jupiter and Saturn) are huge gas balls, which is quite different than Earth and and other three rocky inner planets. Gas giants are primarily composed of gases, such as hydrogen and helium, and a much thicker layer of metallic hydrogen, along with a molten rocky core.

Unlike rocky planets, gas giants do not have a well-defined surface, and there is no clear boundary between where the atmosphere ends and the surface begins. In other words, you wouldn’t be able to land on these planets, as their atmospheres simply become gradually denser towards the core, perhaps with liquid or liquid-like states somewhere in between.
Question 10
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Hydrogen is the first element in the periodic table and has resemblance to alkali metals as well as with halogens. However, its placement in the periodic table has been a subject of discussion in the past. Currently hydrogen is placed in which group?

A
4

B
separate group

C
17

D
1

Solution

Explanation:

H properties matches with alkali metal as well as halogens so it is placed separately

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Hydrogen Test - 1

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Hydrogen Test - 1

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Question 1

liberate water

conducts electricity

liberates dihydrogen gas at cathode

liberates lithium at anode

Solution

Question 2

highly electronegative

covalent

highly electropositive

neutral

Solution

Question 3

they are ionic

they are salt-like hydrides

they are non-stoichiometric hydrides

they are covalent

Solution

Question 4

noble gases,

p-block elements

alkali metals

transition elements

Solution

Question 5

releases lesser energy per unit mass of fuel

does not produce any pollution

is rather unreactive at moderate temperatures

the surface tension is low

Solution

Question 6

mixture of CO and H2

mixture of C, Zn and H2

mixture of CO2 and H2

mixture of C and H2

Solution

Question 7

dihydrogen

protium

deuterium

tritium

Solution

Question 8

In the combined form with other elements and compounds

deuterium

tritium

protium

Solution

Question 9

nitrogen

oxygen

carbondioxide

hydrogen

Solution

Question 10

4

separate group

17

1

Solution

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mixture of CO andH₂

mixture of C, Zn and H₂

mixture of CO₂ and H₂

mixture of C and H₂