Q: Does "High to ultra-high vacuum removes the obstruction of air, allowing particle beams to deposit or remove materials without contamination." provide a valid answer to "Hight to ultra-high vacuums removes what obstruction?"?
A: yes

Q: Does "Tito visited India from December 22, 1954 through January 8, 1955." provide a valid answer to "When did Tito leave India?"?
A: yes

Q: Does "The rebel barons suspected that the proposed baronial council would be unacceptable to John and that he would challenge the legality of the charter; they packed the baronial council with their own hardliners and refused to demobilise their forces or surrender London as agreed." provide a valid answer to "The failure of the agreement lead to what?"?
A: no

Q: Does "In weak basic solutions containing Zn2+ ions, the hydroxide Zn(OH)_2 forms as a white precipitate." provide a valid answer to "Zn(OH)2 is dissolved to form what in strong alkaline solutions?"?
A:
no