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 chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

CNG is:

  1. highly polluting

  2. less polluting

  3. not at all polluting

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Compressed Natural gas is the cleanest of all the fossil fuels, composed primarily of methane. The main products of the combustion of natural gas are carbon dioxide & water vapor, which are the same compounds we exhale when we breathe.  Coal & oil are composed of much more complex molecules, with a higher carbon ratio & higher nitrogen & sulfur contents. This means that when combusted, coal & oil release higher levels of harmful emissions, including a higher ratio of carbon emissions, nitrogen oxides & sulfur dioxide. Coal & fuel oil also release ash particles into the environment, substances that do not burn but instead are carried into the atmosphere & contribute to pollution.

The combustion of natural gas, on the other hand, releases very small amounts of sulfur dioxide & nitrogen oxides, virtually no ash or particulate matter & lower levels of carbon dioxide, carbon monoxide & other reactive hydrocarbons

Multiple choice chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

When CNG undergoes complete combustion, the products formed are:

  1. $CO _2$ and $H _2O$
  2. $CO _2$, $SO _2$ and $H _2O$
  3. $CO _2$ only
  4. $CO _2$ , $CO$ and $H _2O$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Complete Combustion of Natural Gas yields carbon dioxide and water. Complete combustion happens when the hydrocarbon burns in an excess of air. An excess of air means that there is more than enough oxygen to cause all of the carbon to turn into carbon dioxide.

The methane gas burns with a clear blue flame.

methane + oxygen  $\rightarrow$ carbon dioxide + water + energy

$CH _4(g) +  2O _2(g)   \rightarrow  CO _2(g) +  2H _2O(l)$           

The reaction is exothermic. The heat released from burning natural gas is used for central heating and to generate electricity.

Multiple choice chemistry occurrence of carbon compounds in nature substances, objects and energy alternative fuels and energy sources alternative sources of energy

Sewer gases may include:

  1. hydrogen sulfide, ammonia and methane

  2. esters and carbon monoxides

  3. sulfur dioxide and nitrogen oxides

  4. all of them
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sewer gases may include hydrogen sulfide, ammonia, methane, esters, carbon monoxide, sulfur dioxide and nitrogen oxides.
Sewer gas is a generic name for the collection of gases and airborne agents
that often accompany sewage and the natural processes and reactions associated with sewage processing and the decomposition of organic materials.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Which of the following contains methane, hydrogen and carbon dioxide?

  1. Producer gas

  2. Water gas

  3. Coal gas

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

Generally coal mine and coal gas contain Carbon monoxide, carbon dioxide, methane, oxygen, nitrogen, hydrogen, and other hydrocarbons.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

Water gas consists of:

  1. water vapour and coal dust

  2. a mixture of carbon monoxide and hydrogen

  3. a mixture of carbon monoxide and nitrogen

  4. water vapour and methane
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Water gas. Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. Synthesis gas is a useful product, but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.

Multiple choice chemistry rocks and minerals coal and its products study of coal coal

One of the nitrogenous liquid base, that is recovered from coal tar, is:

  1. histidine

  2. pyridine

  3. sulphide

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

Tar bases are the alkaline constituents of distillate oils, remaining after tar acids have been removed. One of the base that is recovered is pyridine, a colourless nitrogenous liquid that has a pungent odour and produces derivatives that are of pharmaceutical value. 

Multiple choice chemistry man made materials environmental impact: plastics plastic plastic plastic waste garbage in, garbage out

Teflon constitutes:

  1. carbon,flourine & hydrogen

  2. carbon,chlorine & hydrogen

  3. carbon & flourine

  4. carbon & chlorine
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Teflon is the brand name of Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene. The constituents of tetrafluoroethylene are carbon and fluorine formula is $ (C _2F _4) _n$. 

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

The highest value of octane number among the following is of:

  1. n-butane

  2. toluene

  3. i-pentane

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

Octane number is a standard measure of the performance of an engine or aviation fuel. The higher the octane number a fuel has, more compression the fuel can withstand before igniting. Also, higher the octane number, better is the performance of the fuel.
In the given options, toluene has the highest octane number.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Anti-knock index (AKI) is the:

  1. geometric mean of RON and MON

  2. arithmetic mean of RON and MON

  3. harmonic mean of RON and MON

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

Octane number can be determined by RON, MON and AKI. The most common method used for the measurement is RON. AKI is the arithmetic mean of RON and MON. 

It is given by : $\frac{R+M}{2}$. 
It is sometimes called as posted octane number.

Multiple choice chemistry quantitative chemistry avogadro hypothesis avogadro's law avogadro law

The gases chlorine, nitrogen, ammonia and sulphur dioxide are collected under the same conditions of temperature and pressure. If 20 litres of nitrogen contains 'x' no. of molecules, state the no. of molecules in 20 litres of ammonia.

  1. x

  2. x/2

  3. x/4

  4. 2x
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to avagadro's law, equal volume of gases contains equal number of molecules. Therefore,  20 litres of ammonia will contain x number of molecule.