D. The lowest temperature at which it catches fire.
Answer: Option D
Solution (By JKSSB Mock Tests)
The ignition temperature (or kindling temperature) is the minimum temperature to which a fuel must be heated so that it catches fire and starts burning spontaneously. A lower ignition temperature means the fuel is more highly flammable and can ignite more easily at ambient conditions.
Explanation:
A catalyst does not initiate a reaction; it only changes the rate of a reaction that is already thermodynamically feasible. It provides an alternative pathway with lower activation energy. It does not change the overall enthalpy (ΔH) or the equilibrium position, and it is recovered unchanged in mass.
Explanation:
The carbon-fluorine bond is one of the strongest covalent bonds, making PTFE resistant to attack by chemicals and heat. The fluorine atoms also shield the carbon backbone.
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