Basic General Knowledge
The ozone layer is being destroyed by chlorofluorocarbons. In this regard which do you consider as the most harmful?

The entire compound
Fluorine atom
Carbon atom
Chlorine atom

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Basic General Knowledge
To produce sound it is necessary that

the vibrations of source are not necessary
the source may execute any type of vibrations
the source should execute transverse vibrations
the source should execute longitudinal vibrations

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