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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Solution

(a) Identification of A, B, and C
(1) A is Carbon $(C)$ . Carbon is an important constituent of our food as compounds of carbon are present in the food that we eat, the clothes that we wear etc.
(2) B is Carbon monoxide $(CO)$ .
Carbon monoxide is a colourless and odourless gas that is produced by the incomplete combustion of materials containing carbon.
Carbon monoxide poisoning can result in brain damage and even death as it has more affinity to combine with haemoglobin than Oxygen $(O_{2})$
(3) C is Carbon dioxide $({CO}_{2})$ .
Carbon dioxide is a major contributor to global warming.
Global warming: It is the gradual increase in the earth’s temperature generally due to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants.
(b) Group of element A in the periodic table
Electronic configuration of Carbon = $1 s^{2} 2 s^{2} 2 p^{2}$
As the last electron enters in p-subshell, so carbon is a p-block element.
For p-block elements, Group number= 12+ Number of electrons in p-subshell
Therefore, Group number= 12+ 2= 14
Hence, carbon belongs to Group 14.

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