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 nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

Choose the correct statement from the following :

  1. Nitrogen is neutral to litmus

  2. Nitrogen is a noncombustible and non-supporter of combustion

  3. Nitrogen is a poisonous gas

  4. At low temperature, nitrogen can be liquefied on compression
Reveal answer Fill a bubble to check yourself
A,B,D Correct answer
Explanation

Nitrogen is a neutral gas hence, it does not show any change with litmus. Nitrogen is inert at atmospheric conditions. Hence, it is noncombustible nor it does not support combustion.  Liquid nitrogen is nitrogen in a liquid state at an extremely low temperature. Hence, at low temperature, nitrogen can be liquefied on compression. Nitrogen is non-poisonous gas and constitutes around 79% of the air.

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

Nitrogen is used in high temperature thermometer:

  1. to prevent vaporization of mercury

  2. to improve conductivity of mercury

  3. to maintain mercury 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
In a memory thermometer, nitrogen gas is filled above the mercury which is inert in nature and doesn't react into mercury.
Introduction of nitrogen increases the pressure on the mercury and hence its boiling point is increased.
So it helps to prevent vaporization of memory and hence mercury is maintained in its liquid state and so the range of mercury can be increased up to $800$$° C$
B.P. of mercury $336.7$$° C$
Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

In Kjeldahl's method, nitrogen present is estimated as:

  1. $N _2$
  2. $NH _2$
  3. $NO _2$

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

Kjeldahl method is a method that is used the quantitatuin estimation of nitrogen conlaining in inorganic substances like $NH _3/NH _4^+$, and in organic substances.In kjeldah's method, notrogen is estimated in following steps : 

$Step$ $1:$Degradation: Sample$+H _SO _4\longrightarrow {(NH _4)} _2SO _4+CO _2+SO _2+H _2O$
$Step$ $2:$ Ammonia is liberated : ${(NH _4)} _2SO _4+2NaOH\longrightarrow Na _2SO _4+2H _2O+2NH _3$
$Step$ $3:$ Ammonia is captured : $B{(OH)} _3+H _2O+NH _3\longrightarrow NH^+ _4+B{(OH)} _4^-$
$Step$ $4:$ Back titration : $B{(OH)} _3+H _2O+Na _2CO _3\longrightarrow NaHCO _3+NaB{(OH)} _4+CO _2+H _2O$
Thus in Kjeldahl's method, nitrogen present is estimated as $NH _2$.

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

Examples of sublimate does not include:

  1. ammonium salts

  2. nitrates

  3. iodine

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

Nitrates do not sublime whereas ammonium salts, iodine and naphthalene undergo sublimation.
Note:
Condensed solid produced during sublimation is sublimate.
Thus, sublimate is a solid deposit of a substance which has sublimed.

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

Non-reacting gases have the tendency to mix with each other. What is this phenomenon called?

  1. Evaporation

  2. Diffusion

  3. Effusion

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

Non reacting gases not reacted with each other so they only mix by diffusion.

Diffusion of gases. a natural process, in which molecules of a gas pass from an area of high concentration to one of lower concentration.

Multiple choice zoology ecosystems decomposition in ecosystem ecosystem productivity and decomposition producers, consumers and decomposers

Which of the following gases is/are produced by decomposers during the decaying process?

  1. Only carbon dioxide gas

  2. Only carbon dioxide and nitrogen gases

  3. Only oxygen gas

  4. Only carbon dioxide and oxygen gases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Decomposers feed on the dead or decaying organic matter(carbohydrate, proteins and lipids ) and produce nitrogen and carbon dioxide gases as an organic matter are mainly made up of carbon, oxygen, hydrogen and nitrogen. Thus, the correct answer is option B.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Carbon dioxide is associated with:

  1. Elements

  2. Mixture

  3. Compound

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

Carbon dioxide is a naturally occurring chemical compound composed of 2 oxygen atoms each covalently double bonded to a single carbon atom. It is a gas at standard temperature and pressure and exists in Earth's atmosphere in this state, as a trace gas at a concentration of $0.04 \%$ by volume.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Gases mix at the molecular level. In an experiment, oxygen molecules were added to hydrogen molecules. This on burning became a substance that had both oxygen and hydrogen. What is this product?

  1. Mixture

  2. Compound

  3. Both a mixture as well as a compound

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

The product is water. It is formed after a chemical change (burning) and the properties of water is different from hydrogen and oxygen.

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

The mixture of $CO$ and $N _2$ is called as :

  1. Water gas

  2. Producer gas

  3. Synthetic gas

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

Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning. 
Producer gas: a gas composed of carbon monoxide, hydrogen, and nitrogen, obtained by passing air and steam through incandescent coke.
Syngas/synthesis gas, is a fuel gas mixture consisting primarily of hydrogen, carbon monoxide, and very often some carbon dioxide.
Marsh gas is methane $CH _4$.

Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Biogas contains

  1. Traces of CH$ _4$
  2. 30-40% of CH$ _4$
  3. 50-70% of CH$ _4$
  4. 80% of C$ _2$H$ _6$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Biogas is a mixture of methane and carbon dioxide produced by bacterial degradation of organic matter and used as a fuel.
Biogas is comprised primarily of methane and carbon dioxide. 
It contains methane (50-70%), carbon dioxide (30-50%), and very small amounts of hydrogen and hydrogen sulphide. 
Biogas typically refers to a (biofuel) gas produced by the anaerobic digestion or fermentation of organic matter including manure, sewage sludge, municipal solid waste, biodegradable waste or any other biodegradable feedstock, under anaerobic conditions. 
Thus, the correct answer is option C.
Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Gobar gas contains mainly

  1. CH$ _{4}$ + CO$ _{2}$
  2. CH$ _{4}$ + O$ _{2}$
  3. CO$ _{2}$ + H$ _{2}$
  4. CO$ _{2}$ + SO$ _{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Biogas (gobar gas) is primarily methane (CH$ _4$) and carbon dioxide (CO$ _2$) and may have small amounts of hydrogen sulphide (H$ _2$S), moisture and siloxanes.

Thus, the correct answer is option A.