Power Systems Circuit Breakers Classification of Circuit Breakers

Which of the following statements is NOT true about the SF6 circuit breaker? 

1
SF6 gas has excellent insulating property.
2
The negative ion is formed when a free electron collides with the SF6 gas molecule; it is absorbed by that gas molecule.
3
In the SF6 circuit breaker, the current carrying contacts operate in the medium sulphur hexafluoride gas.
4
SF6 gas has low electro-negativity.

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