question_answer 81)

  A non-metal A is an important constituent of our food and forms two oxides B and C. Oxide B is toxic whereas C causes global warming. (a) Identify A, B and C. (b) To which group of periodic table does A belong?

Answer:

                  (a)Non-metal A is carbon. Its two oxides are carbon monoxide (CO) and carbon dioxide. From these, B is carbon monoxide (CO) as it is toxic while C is carbon dioxide (),because it is responsible for global warming. (b) Electronic configuration of C is 2, 4 (atomic weight of C = 6). It is present in 14th group (10 + valence electrons), i.e., IV A of the periodic table.