Chemical Engineering - Chemical Engineering Basics - Discussion

CCl4 is incombustible because the combustion products will have higher energy content than that of the reactants. For combustion to take place, the products should contain stable compounds (lower energy content) eg. H2O, CO2 etc. Than that of the reactants. CCl4 is very stable due to its structure.

Combustion means reaction with oxygen or burning in layman's term.

Hypothetically, for combustion of CCl4 , the following reaction would have occurred :

CCl4 + O2 -> CO2 + 2 Cl2

For feasibility of any reaction, the sum of bond energy of all the products should be less than sum of bond energy of all the reactants.

In this case, breaking of O-O, and four C-Cl bonds require more energy than forming two C-O and two Cl-Cl bonds. Hence, CCl4 does not react with Oxygen and is incombustible

Among the options given, the incombustible substance is CCl4 (carbon tetrachloride).

Here’s why;

-> H2 (hydrogen gas) is highly combustible and burns with a pale blue, almost invisible flame.

-> C2H2 (acetylene) is also highly combustible and is often used as a fuel in welding torches.

-> S (sulfur) is combustible and burns with a blue flame, producing sulfur dioxide.

-> CCl4 (carbon tetrachloride), on the other hand, does not support combustion and is used as a fire extinguishing agent and in other applications where non-flammability is required.

CCL4 is a tetrahydral structure so that it is quit stable compare to this.

CCl4 used as fire extinguisher.

CCl4 is used as fire extinguisher.

It is colorless liquid, fire extinguisher, cleaning agent in industry.

Among the options given, the incombustible substance is CCl4 (carbon tetrachloride).

Here’s why;

-> H2 (hydrogen gas) is highly combustible and burns with a pale blue, almost invisible flame.

-> C2H2 (acetylene) is also highly combustible and is often used as a fuel in welding torches.

-> S (sulfur) is combustible and burns with a blue flame, producing sulfur dioxide.

-> CCl4 (carbon tetrachloride), on the other hand, does not support combustion and is used as a fire extinguishing agent and in other applications where non-flammability is required.

Chlorine being an electronegative element, would like to connect to an electropositive element carbon, as it can pull the electron pair closer to itself.

Among the options given, the incombustible substance is CCl4 (carbon tetrachloride).

Here’s why;

-> H2 (hydrogen gas) is highly combustible and burns with a pale blue, almost invisible flame.

-> C2H2 (acetylene) is also highly combustible and is often used as a fuel in welding torches.

-> S (sulfur) is combustible and burns with a blue flame, producing sulfur dioxide.

-> CCl4 (carbon tetrachloride), on the other hand, does not support combustion and is used as a fire extinguishing agent and in other applications where non-flammability is required.