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A non-metal A is an important constituen...

 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? 

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Non-metal A is carbon. Its two oxides are carbon monoxide (CO) and carbon dioxide `(CO_(2))`. Out of these, B is carbon monoxide (CO) as it is toxic while C is carbon dioxide `(CO_(2))` because it is responsible for global warming.
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OSWAL PUBLICATION-METALS AND NON-METALS-NCERT Exemplar (Long answer questions)
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  2. A non-metal A is an important constituent of our food and forms two ox...

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