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The collection contains typical problems and tasks that cover the educational topics of the chemistry course for grades 10-11 with samples of their solutions. A significant number of tasks enables the teacher to use them in the current learning activities of students, as well as to form the necessary number of variants from them for testing. The second section offers cognitive tasks, tasks of everyday, industrial, and environmental content, which aim to promote the formation of key and subject competences of students, and help to assess the role of chemical science in modern society. Recommended for teachers and students of secondary schools, lyceums, and gymnasiums.