Chemistry

Chemistry of Gases and Applications

1,175 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 let's play with water law of constant proportion - i law of constant proportion law of definite proportions

Two gases found dissolved in natural water are 

  1. oxygen and carbon dioxide

  2. hydrogen and oxygen

  3. sulphur dioxide and hydrogen

  4. chlorine and ammonia
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Natural water, such as that found in rivers and lakes, contains dissolved gases like oxygen (essential for aquatic life) and carbon dioxide (from the atmosphere and respiration).

Multiple choice evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

Agent Orange consisted of

  1. 2,4 - D

  2. 2,4,5-T

  3. Dioxin as contaminant

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Agent Orange refers to a herbicide mixture which was used by the U.S. military during the Vietnam War and it contained a dangerous chemical contaminant called dioxin. 
  • The active ingredient of Agent Orange was an equal mixture of two phenoxy herbicides – 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4,5 trichlorophenoxyacetic acid (2,4,5-T) and it also contained traces of the dioxin 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD).
  • So the correct option is ' All of the above'.
Multiple choice biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

Dinitrogen and dioxygen are main constituents of air, but these do not react with each other to form oxides of nitrogen because:

  1. the reaction is endothermic and requires very high temperature

  2. the reaction can be initiated only in presence of a catalyst

  3. oxides of nitrogen are unstable
  4. $N _{2}$ and $O _{2}$ are unreactive
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The main component of air are oxygen and they will only react together at a normal temperature. For the formation of oxides of nitrogen, a very high temperature is required. 

Multiple choice biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

Argon is the major constituent of inert gases present in air.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Argon is the most abundant and most used of the noble gases. Its chief uses are in metallurgy, where it provides an inert atmosphere in which hot metals can be worked. Because argon is so very unreactive, it prevents chemical reactions of the very hot metal being welded or forged.

Multiple choice biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

The gases which are inert and present in extremely low concentrations are:

  1. neon

  2. helium

  3. argon

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

Xenon is a noble gas present in the Earth's atmosphere in extremely low concentrations (about 0.087 ppm). While neon, helium, and argon are also inert, xenon is significantly rarer than the others listed.

Multiple choice biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

Which of the following is most abundant on earth except from hydrogen?

  1. Krypton

  2. Helium

  3. Neon

  4. Argon
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The abundances of the noble gases decrease as their atomic numbers increase. Helium is the most plentiful element in the universe except hydrogen. All the noble gases are present in Earths atmosphere and, except for helium and radon, their major commercial source is the air, from which they are obtained by liquefaction and fractional distillation.

Multiple choice biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

An inert gas is a gas that is:

  1. Highly reactive

  2. Non-reactive

  3. Both a and b

  4. None of above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An inert gas is a gas that is generally non-reactive with other substances. The term inert means non-reactive. We refer to gases as being chemically inert if their atoms don't combine with other atoms in chemical reactions.

Multiple choice biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

Most common inert gases are:

  1. Helium

  2. Krypton

  3. Argon

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

When we refer to inert gases, we are usually referring to six primary ones, also called the noble gases. Meet the most common inert gases: helium $\left(He\right)$, argon $\left(Ar\right)$, neon $\left(Ne\right)$, krypton $\left(Kr\right)$, xenon $\left(Xe\right)$, and radon $\left(Rn\right)$.

Multiple choice biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

Why are some gases inert?

  1. They are stable

  2. They have 5 electrons in their last shell

  3. They do not have sufficient atoms to react

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

Most atoms do not have 8 electrons in this outer orbital so they react with other atoms to form bonds to fill their outer electron orbital. The atomic structure of the noble gases is different from the structure of most atoms because they have a filled outer orbital.

Multiple choice biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

Nitrogen is liberated by the thermal decomposition of only :

  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
A 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.