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Multiple choice chemistry chemical reactions of organic compounds combustion and thermal cracking of hydrocarbons chemical properties of carbon compounds chemical properties of organic compounds

Carbon monoxide is produced by :

  1. incomplete combustion of fuels

  2. complete combustion of fuels

  3. neutralization of fuels

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

Carbon monoxide is produced by incomplete combustion of fuels.
The complete combustion of fuels will give carbon dioxide.
$\displaystyle C + \dfrac {1}{2}O _2 \rightarrow CO$
$\displaystyle C +  O _2 \rightarrow CO _2$

Multiple choice chemistry chemical reactions of organic compounds combustion and thermal cracking of hydrocarbons chemical properties of carbon compounds chemical properties of organic compounds

LPG is liquefied petroleum gas which is a compound of butane and propane and used as :

  1. cooking fuel

  2. motor fuel

  3. refrigeration

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

LPG is liquefied petroleum gas which is a compound of butane and propane. It is used as cooking fuel (in heating appliances, cooking equipment), motor fuel (in vehicles) and refrigeration.


Hence the correct option is D.

Multiple choice chemistry chemical reactions of organic compounds combustion and thermal cracking of hydrocarbons chemical properties of carbon compounds chemical properties of organic compounds

 $C _3H _8 + 5O _2\rightarrow  3CO _2 + H _2O$

Name the type of reaction.

  1. Substitution

  2. Combustion

  3. Hydrogenation

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

The reaction $\displaystyle C _3H _8 + 5O _2\rightarrow  3CO _2 + H _2O$ is an example of combustion reaction. Propane on complete combustion in  presence of excess oxygen gives carbon dioxide and water.

Multiple choice chemistry chemical reactions of organic compounds combustion and thermal cracking of hydrocarbons chemical properties of carbon compounds chemical properties of organic compounds

LPG has a lower energy density than either petrol or fuel-oil, so the equivalent  ______ is higher.

  1. fuel-consumption

  2. fuel-absorption

  3. fuel density

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

LPG has a lower energy density than either petrol or fuel-oil, so the equivalent fuel-consumption is higher.
Lower energy density means lesser amount of energy is released during combustion of unit mass of fuel. Hence, to obtain certain quantity of fuel more fuel should be combusted.

Multiple choice chemistry chemical reactions of organic compounds combustion and thermal cracking of hydrocarbons chemical properties of carbon compounds chemical properties of organic compounds

LPG can be used as a power source for :

  1. combined heat and power technologies (CHP)

  2. combined heat and energy technologies ( CHP)

  3. combined heat and coal technologies (CHP)

  4. heat and power technologies
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

LPG can be used as a power source for combined heat and power technologies (CHP).
Combined  heat and power (CHP) is the simultaneous generation of electricity and useful heating from the combustion of a fuel. It is a thermodynamically efficient use of fuel.

Multiple choice chemistry chemical reactions of organic compounds combustion and thermal cracking of hydrocarbons chemical properties of carbon compounds chemical properties of organic compounds

Statement 1 : When a hydrocarbon is combusted in air, carbon monoxide is the major product.
Statement 2 : Air contains much more nitrogen than oxygen.

  1. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.</p>

  2. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.</p>

  3. <p>Statement 1 is correct but Statement 2 is not correct.</p>

  4. <p>Statement 1 is not correct but Statement 2 is correct.</p>

  5. <p>Both the Statement 1 and Statement 2 are not correct. </p>
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement 1 : When a hydrocaron is combusted in air, $CO _2$ is the major product whereas the $CO$ is produced if there is incomplete combustion of some hydrocarbon.
Statement 2: Air contains much more nitrogen than air.
$N _2= 78$%
$O _2 = 21$%

Multiple choice chemistry hydrocarbons introduction to alkenes - ethyne acetylene alkynes

Sodium fumarate on Kolbes electrolysis gives :

  1. Ethene

  2. Ethyne

  3. Ethane

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

Kolbe's electrolysis of sodium fumarate (a salt of an unsaturated dicarboxylic acid) results in the formation of ethyne (acetylene) due to the elimination of CO2 and formation of a triple bond.

Multiple choice chemistry hydrocarbons introduction to alkenes - ethyne acetylene alkynes

The compound used in Hawker's lamp and in light houses for illumination purposes is :

  1. methane

  2. ethane

  3. ethylene

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

Acetylene is used in-
Illumination of cycle lamps, hawker's lamps and buoys in light houses.
Producing oxyacetylene flame for welding and cutting.

Multiple choice chemistry hydrocarbons introduction to alkenes - ethyne acetylene alkynes

A hydrocarbon of molecular formula , ${C _6}{H _{10}}$ reacts with sodamide and the same on ozonolysis followed by hydrogen peroxide gives two molecules of carboxylic acids, one being optically active. Then the hydrocarbon may be

  1. $1$ hexyne
  2. $2- hexyne$
  3. $3$ hexyne
  4. $3$ methyl $1$ pentyne
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice chemistry hydrocarbons introduction to alkenes - ethyne acetylene alkynes

Product formed on electrolysis of potassium salt of fumaric and maleic acid is

  1. Ethene

  2. Ethane

  3. Butane

  4. Ethyne

  5. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Electrolysis of the potassium salts of fumaric or maleic acid (unsaturated dicarboxylic acids) yields ethyne via Kolbe's electrolysis.