True or false no explanation required

6. The combustion process using pure oxygen produces higher NOx concentrations than the combustion using air. 7. ESP's remove particles from a gas stream, by charging them and causing them to be deposited on grounded collection plates. 8. ESP's are capable of collection efficiencies of greater than 99% 9. Spray towers cannot be used in a cross current arrangement. 10. The most important operating parameter used to evaluate the performance of a thermal oxidizer is the outlet gas temperature