Chemical Engineering - Chemical Engineering Basics - Discussion
Discussion Forum : Chemical Engineering Basics - Section 1 (Q.No. 1)
1.
Which one of the following is incombustible ?
Discussion:
47 comments Page 2 of 5.
Muhammad Ahmed said:
3 years ago
Incombustible means?
(3)
Paras Jain said:
5 years ago
Since both, chlorine and oxygen, are electronegative elements therefore the combustion reaction CCl4 + 2 O2 ---> CO2 + 2 Cl2O doesn't take place.
(5)
Pratik patel said:
5 years ago
CCL4 is a tetrahydral structure so that it is quit stable compare to this.
(1)
Bhushan Meshram said:
6 years ago
Chlorine being an electronegative element, would like to connect to an electropositive element carbon, as it can pull the electron pair closer to itself.
Whajah Bernard said:
6 years ago
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.
(2)
ANVESH said:
8 years ago
Consider the combustion of a simple molecule methane CH4:
CH4 + 2O2 = CO2 + 2H2O.
However, if we consider a similar molecule CCl4, carbon tetrachloride, which is just a replacement of H by Cl in methane, is incombustible.
This can be explained by observing the reaction above. CH4 burns to give CO2 and Water. Hydrogen being an electropositive element joins oxygen quickly.
However, chlorine being an electronegative element would like to connect to an electropositive element carbon, as it can pull the electron pair closer to itself!
Getting Cl in +1 state is difficult.
So the reaction
CCl4 + 2O2 = CO2 + 2Cl2O is least probable.
Because it doesn't combust, it was used as a fire extinguisher under the name pyrene.
CH4 + 2O2 = CO2 + 2H2O.
However, if we consider a similar molecule CCl4, carbon tetrachloride, which is just a replacement of H by Cl in methane, is incombustible.
This can be explained by observing the reaction above. CH4 burns to give CO2 and Water. Hydrogen being an electropositive element joins oxygen quickly.
However, chlorine being an electronegative element would like to connect to an electropositive element carbon, as it can pull the electron pair closer to itself!
Getting Cl in +1 state is difficult.
So the reaction
CCl4 + 2O2 = CO2 + 2Cl2O is least probable.
Because it doesn't combust, it was used as a fire extinguisher under the name pyrene.
(5)
S KANNATHASAN said:
8 years ago
CCl4 used as fire extinguisher.
(1)
Rajendra Kotkar said:
8 years ago
CCl4 is used as fire extinguisher.
(1)
Panchanan panda said:
8 years ago
Carbon tetrachloride has a high degree of liver toxicity, so it is banned in consumer products in the United States. Historically, it was used as a refrigerant, a fire suppression agent, and a cleaning solvent like Carbon Tetrachloride, it saw use as a refrigerant and cleaning solvent.
Ganesh said:
8 years ago
CCl4 used as a fire extinguisher.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers