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 eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Pollen grains can be stored in a viable condition for many years in which of the following conditions?

  1. Anaerobic conditions in 0$^o$ C
  2. Liquid nitrogen (-196$^o$ C)
  3. Liquid nitrogen (0$^o$ C)
  4. Liquid hydrogen (196$^o$ C)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Pollen grains are stored for many years in the liquid nitrogen, having the temperature of -196 degrees of Celsius. This method of saving is called cryopreservation. The low temperature allows storing for a longer period as it reduces the growth rate of cells. The cryoprotective agents delay the aging of the plants and protect the plants from the damages due to cold.
So, the correct answer is 'Liquid nitrogen (-196$^o$ C)'.
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.

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

Sewer gas is a complex mixture of:

  1. toxic and nontoxic gases

  2. toxic gases

  3. nontoxic gases

  4. inert gases
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sewer gas is a complex mixture of toxic and nontoxic gases produced and collected in sewage systems by the decomposition of organic household or industrial wastes, typical components of sewage. Sewer gases may include hydrogen sulfide, ammonia, methane, esters, carbon monoxide, sulfur dioxide and nitrogen oxides.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

The gas that shows the most variation from place to place and from time to time in the lower atmosphere ___________

  1. Ozone ($\displaystyle { O } _{ 3 }$)
  2. Carbon dioxide ($\displaystyle { CO } _{ 2 }$)
  3. Water vapor ($\displaystyle { H } _{ 2 }O$)
  4. Argon ($\displaystyle Ar$)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The layer of the atmosphere closest to the earth is the troposphere also known as the lower atmosphere fixed composition of various constituents of air namely the carbon dioxide, nitrogen, ozone, rare gases etc, but the amount of water vapour varies from place to place and from time to time.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Atmospheric composition is 

  1. Argon

  2. Helium

  3. Iron

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An envelope of gas that surrounds earth is called atmosphere. It contains 78% nitrogen, 21% oxygen, 0.03% carbon dioxide, 0.9% argon and traces of other gases like helium, little amount of water vapour, dust particles and other solid particles. So, the correct option is D. 

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Which one disappeared from earlier atmosphere during its conversion to prime atmosphere?

  1. Atomic state of gases

  2. Oxygen

  3. Ammonia

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As the Earth cooled and the atmosphere evolved, atomic gases (which were unstable) and free oxygen (which was highly reactive) were largely absent or consumed in chemical reactions. Both are considered to have been absent or disappeared during the transition.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Earliest hot atmosphere of earth contained :

  1. Molecules of hydrogen, Carbon and NItrogen

  2. Atoms of Hydrogen, Carbon, Oxygen and Nitrogen

  3. Atoms of Hydrogen, Sulphur and Carbon

  4. Molecules of Hydrogen, Methane and Ammonia
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the extremely hot, early stages of Earth, the atmosphere consisted of simple atoms like hydrogen, carbon, oxygen, and nitrogen, which had not yet formed complex stable molecules due to the intense thermal energy.

Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

Which among the following alkane has largely replaced the ozone layer-depleting halomethanes in household refrigerators and freezers?

  1. Methane

  2. Propane

  3. Butane

  4. Ethane
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Butane and other hydrocarbons like isobutane are commonly used as eco-friendly alternatives to CFCs in modern refrigeration systems because they have zero ozone depletion potential.

Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

The common refrigerant chlorofluoromethane (freon) and NO$ _x$ is a serious pollutant because

  1. It destroys haemoglobin
  2. It disrupts O$ _3$ layer

  3. It lowers atmospheric temperature

  4. It prevents cloud condensation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chlorofluorocarbons (Freons) release chlorine radicals in the stratosphere, which react with and destroy ozone (O3) molecules, leading to the depletion of the ozone layer.

Multiple choice commercial applications global environmental change causes of resource depletion causes of greenhouse effect ozone layer depletion

An ozone depleting chemical, which is used in fire- extinguishers is ________.

  1. Nitrogen oxide

  2. Methyl bromide

  3. Halon

  4. Chlorofluorocarbon
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Methyl bromide, halon, nitrogen oxides and chlorofluorocarbons are the potent ozone-depleting substances. These accumulate in the stratosphere and undergo photodissociation when exposed to the UV rays. The reactive chlorine and bromine react with ozone to form diatomic oxygen and molecular oxygen.

A. Nitrogen oxides are released from the vehicular exhausts and industrial emissions.
B. Methyl bromide was used as a fumigant.
C. Halon was used as fire-extinguisher.
D. Chlorofluorocarbons were used as refrigerants.
Hence, the correct answer is 'Halon'.