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 water and air and their importance natural cycles and resources constituents of air component of air - nitrogen
Nitrogen is used in high-temperature thermometer :

  1. To prevent vaporization of mercury.

  2. To improve conductivity of mercury.

  3. To maintain mercury to remain in its state.

  4. To increase the specific heat capacity of mercury.
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation
The principle used to measure temperature is that of the apparent thermal expansion of the liquid. An inert gas is used for mercury intended to high temperature. The thermometer is filled with an inert gas such as argon or nitrogen above the mercury to reduce its volatilization.

Hence, both options (A) and (C) are correct.
Multiple choice chemistry water and air and their importance natural cycles and resources constituents of air component of air - nitrogen

The potato chips manufacturers uses _____ gas to flush the chips bags to prevent the chips getting oxidised.

  1. Oxygen

  2. Carbon dioxide

  3. Chlorine

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

Oil and fat containing food items are flushed with nitrogen because the food containing fats and oil become rancid after sometime because of oxidation and give smell having a bad taste. Presence of nitrogen helps food to save from rancidity.

Multiple choice chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

Lime water turns milky when exposed. to air and stirred. This shows that air contains:

  1. carbon dioxide

  2. hydrogen

  3. nitrogen

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

Lime water turns milky when exposed to air and stirred as lime water mixes with $CO _{2}$ and forms $CaCO _{3}$ (calcium carbonate) which turns the lime water milky. 

$CaO+CO _{2} \longrightarrow CaCO _{3}$

Multiple choice chemistry element, compound and chemical reaction materials around us materials around us and different types of houses matter and its states

Plasma state contain ionized gas particles.

  1. True

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

Plasma state is obtained by heating gases to very high temperature. During heating of the gases, the electrons get extracted from the atom. Because of this the formation of the positively charged nucleus and negatively charged electrons takes place in the gas. This causes ionization of the gas.

Multiple choice chemistry element, compound and chemical reaction materials around us materials around us and different types of houses matter and its states

Gas can be turned into a plasma on earth with the addition of:

  1. great amounts of energy

  2. great amounts of liquid

  3. another gas

  4. water

  5. great amounts of time
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plasma is called fourth state of matter. In this state every substance remains in gaseous state, this gas has only ions and free electrons. This state is obtained by freeing all the electrons from the attraction of nucleus. To make the electrons free from nucleus we have to give them energy equal to or greater than the energy by which they are bound with nucleus, therefore for that we require a great amount of energy.

Multiple choice chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

Which of the following air pollutant has a smell of rotten egg?

  1. Hydrogen sulphide

  2. Hydrogen chloride

  3. Ammonia

  4. Nitric acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydrogen sulfide gas is a naturally occuring chemical. The gas has a characteristic rotten egg odor at low concentrations. About half of the population can smell it at concentrations as low as 8 parts per billion (ppb) in air, and more than 90% can smell it at levels of 50 ppb.  At higher concentrations, hydrogen sulfide rapidly deadens the sense of smell.

Multiple choice chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

Oil or natural gas is considered sour if it has a high percentage of:

  1. hydrogen chloride

  2. sulphuric acid

  3. hydrogen sulphide

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

Hydrogen sulfide gas is found in petroleum and natural gas. Oil or natural gas is considered sour if it has a high percentage of hydrogen sulfide. Natural gas can contain up to 28 percent hydrogen sulfide gas, consequently,  it may be an air pollutant near petroleum refineries and in oil and gas extraction areas.

Multiple choice chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

 Automobile emits which gases (in large quantities):


  1. $NO$ and $NO _2$
  2. $CO$ and $CO _2$
  3. $NO _2$
  4. $NO$ and $N _2O _5$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Air pollution from cars and trucks is split into primary and secondary pollution. Primary pollution is emitted directly into the atmosphere; secondary pollution results from chemical reactions between pollutants in the atmosphere. The following are the major pollutants from motor vehicles:

  1. Particulate matter (PM)
  2. Hydrocarbons (HC)
  3. Nitrogen oxides (NOX)
  4. Carbon monoxide (CO)
  5. Sulfur dioxide
  6. Hazardous air pollutants
  7. Greenhouse gases

Multiple choice chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

Which gas on exposure to high concentrations can cause unconsciousness, known as "knockdown," which can be lethal?

  1. Hydrogen sulphide

  2. Galena

  3. carbon-monoxide

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

$H _2S$ being toxic causes a wide range of health hazards such as nausea, tearing of eyes, headache or loss of sleep or bronchial problems in some asthma patients; acute exposure causes rapid unconsciousness,' knockdown ' or immediate collapse, death within minutes.

Hence, option $A$ is correct.

Multiple choice chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

Which gas has a high risk of health effects during its release in industries using oil or natural gas?

  1. Galena

  2. Carbon monoxide

  3. Hydrogen sulfide

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

$H _2S$ has high risk of health hazards; such as nausea, hearing of eyes, headache or loss of sleep or bronchial problem in some asthama patients; acute exposure causes rapid unconsciousness, 'knockdown' or immediate collapse, death within minutes. 

Multiple choice chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

What is the smell of hydrogen sulphide at a concentration of 200 ppm?

  1. Pleasant odour

  2. Rotten egg odour

  3. No smell

  4. Rotten fish smell
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  At higher concentrations, hydrogen sulfide rapidly deadens the sense of smell which means the ability to sense the smell of anything will be no more at such high temperature.  For most people, this occurs at approximately $150ppm$. The gas has a characteristic rotten egg odour at low concentrations. About half of the population can smell it at concentrations as low as 8 parts per billion ($ppb$) in the air.


Hence, the correct option is C.

Multiple choice chemistry study of the first element - hydrogen position of hydrogen in the periodic table hydrogen in periodic table trends in groups and periods

Among I-A elements, which element is gas at room temperature?

  1. Hydrogen

  2. Lithium

  3. Sodium

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

At standard temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, non-metallic, highly combustible diatomic gas. It is highly flammable and forms an explosive mixture with air.