Chemistry

Chemistry of Gases and Applications

1,190 Questions

The chemistry of gases covers atmospheric composition, noble gases, and various applications of gas compounds in industrial and biological processes. Understanding the properties of common gases, their reactions, and environmental occurrences is vital for general science sections. Use these questions to practice identifying gases and their specific uses.

Atmospheric gasesNoble gasesGas applicationsChemical compounds

Chemistry of Gases and Applications Questions

Multiple choice evs how to save fuel define fossil fuels conservation of fuels reason for finishing of materials (resources) fuel and conservation

Natural gases are nothing but _______ .

  1. Compressed natural gas

  2. Compressed gas

  3. Normal gases

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Natural gas is a naturally occurring gas mixture consisting primarily of methane, but including higher alkanes and sometimes a small percentage of $CO _2,N _2,H _2S$ or helium.


Whereas compressed natural gas is methane stored at high pressure. So, natural gas is nothing but CNG.

Hence the option A is correct.

Multiple choice chemistry preparation of gases nitrogen gas component of air - nitrogen nitrogen

Nitrogen is liberated by the thermal decomposition of :

  1. $NH _4NO _2$
  2. $NaN _3$
  3. $(NH _4) _2Cr _2O _7$

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

$ { { (NH } _{ 2 }) } _{ 2 }{ Cr } _{ 2 }{ O } _{ 7 }\xrightarrow [ thermal\quad decomposition ]{ \Delta  } { Cr } _{ 2 }{ O } _{ 3 }+{ N } _{ 2 }+4{ H } _{ 2 }O\ N{ H } _{ 4 }{ NO } _{ 2 }\xrightarrow [ thermal\quad decomposition ]{ \Delta  } { N } _{ 2 }+2{ H } _{ 2 }O\ 2{ NaN } _{ 3 }\xrightarrow [ thermal\quad decomposition ]{ \Delta  } 2Na+3{ N } _{ 2 } $

Hence, all of these. 

Multiple choice chemistry preparation of gases nitrogen gas component of air - nitrogen nitrogen

Out of the following which does not liberate $N _2$ gas on heating?

  1. $NaNO _2+NH _4Cl$
  2. $Ba(N _3) _2$
  3. $O _3+NO$
  4. $(NH _4) _2Cr _2O _7$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A. $NaNO _2+NH _4Cl\longrightarrow N _2+2H _2O+NaCl$

B. $Ba(N _3) _2\longrightarrow Ba+3N _2$
C. $O _3+NO\longrightarrow NO _2+O _2$
D. $(NH _4) _2Cr _2O _7 \longrightarrow N _2+Cr _2O _3+4H _2O$
Hence, answer is $O _3+NO$..

Multiple choice chemistry preparation of gases nitrogen gas component of air - nitrogen nitrogen

Nitrogen is obtained by the thermal decomposition of :

  1. $NH _4NO _2$
  2. $NH _4NO _3$
  3. $AgNO _3$
  4. $Pb(NO _3) _3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Reactions are:

$NH _4NO _3\rightarrow N _2O+H _2O$

$NH _4NO _2\rightarrow N _2+H _2O$

$AgNO _3\rightarrow Ag+NO _2+1/2O _2$

So, nitrogen is obtained from $NH _4NO _2$

Multiple choice chemistry preparation of gases nitrogen gas component of air - nitrogen nitrogen

On heating ammonium dichromate, the gas evolved is:

  1. oxygen.

  2. ammonia.

  3. nitrous oxide.

  4. nitrogen.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$ (NH _4) _2Cr _2O _7(s) \rightarrow N _2(g) + 4H _2O(g) + Cr _2O _3(s)$ 


Ammonium dichromate decomposes on heating to produce nitrogen gas water vapour (gaseous due to the temperature of the reaction), and solid chromium(III) oxide.

Multiple choice chemistry preparation of gases nitrogen gas component of air - nitrogen nitrogen

Density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepared by chemical reaction from a compound of nitrogen, because aerial nitrogen contains: 

  1. $CO _2$

  2. Argon
  3. some $N _2$ molecules analogous to $O _2$
  4. greater amount of $N _2$ molecules derived from $N-15$ isotope
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The density of nitrogen gas prepared from the air is slightly greater than that of nitrogen prepared by chemical reaction from a compound of nitrogen, because aerial nitrogen contains a greater amount of $\displaystyle N _2$ molecules derived from $\displaystyle N-15$ isotope.
Note: Molecules containing $\displaystyle N-15$ isotope are heavier than molecules containing$\displaystyle N-14$ isotope as N atom has more number of neutrons.

Multiple choice chemistry preparation of gases nitrogen gas component of air - nitrogen nitrogen

Which of the following gives nitrogen on thermal decomposition?

  1. Ammonium nitrite

  2. Ammonia

  3. Ammonium dichromate

  4. Air
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

$ { { (NH } _{ 2 }) } _{ 2 }{ Cr } _{ 2 }{ O } _{ 7 }\xrightarrow [ thermal\quad decomposition ]{ \Delta  } { Cr } _{ 2 }{ O } _{ 3 }+{ N } _{ 2 }+4{ H } _{ 2 }O\ N{ H } _{ 4 }{ NO } _{ 2 }\xrightarrow [ thermal\quad decomposition ]{ \Delta  } { N } _{ 2 }+2{ H } _{ 2 }O $

Ammonium nitrite and Ammonium dichromate both give nitrogen on thermal decomposition.

Multiple choice chemistry rocks and minerals coal petroleum non-renewable sources of energy

Natural gas mainly consist of:

  1. $C _2H _6$
  2. $CH _4$
  3. $C _3H _3$
  4. $C _4H _{10}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Natural gas is naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly includes varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide or helium.
So answer is B.
Multiple choice chemistry rocks and minerals coal petroleum non-renewable sources of energy

Choose the incorrect statement among the following.

  1. Many useful substances are obtained from petroleum and natural gas. These are termed as 'petrochemicals'

  2. Hydrogen gas obtained from natural gas is used in the production of fertilizers

  3. Due to the great commercial importance of petroleum, it is also called 'black gold'

  4. Natural gas is stored under low pressure as compressed natural gas (CNG)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CNG is made by compressing natural gas (which is mainly composed of methane, CH4 stored at high pressure), to less than 1 percent of the volume, it occupies at standard atmospheric pressure. It is stored and distributed in hard containers at a pressure of 20–25 MPa (2,900–3,600 psi), usually in cylindrical or spherical shapes.

Thus they are stored under high pressure.