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.

B and C are :

B is carbon, C is carbon monoxide

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C is carbon, B is carbon monoxide

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B is carbon monoxide, C is carbon dioxide

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C is carbon monoxide, B is carbon dioxide

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Solution

The correct option is C B is carbon monoxide, C is carbon dioxide
The carbohydrates in the human diet are mainly in the form of starches and sugars.

Carbohydrates are formed by carbon, hydrogen and oxygen in the proportions 6:12:6. They produce energy, liberating carbon dioxide ( $C O_{2}$ ) and water ( $H_{2} O$ ).

Oxide of carbon is Carbon mono oxide and carbon dioxide, in which CO when combining to haemoglobin it stops the distribution of oxygen to the cells via haemoglobin. Even low concentrations of CO can be fatal because of this preference of Fe for CO.

$C O_{2}$ gas causes global warming.

Hence the correct option is C.

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(b) Carbon monoxide burns in air with a ___ flame to form carbon dioxide.

(d) A mixture of 95 $%$ oxygen and 5 $%$ carbon dioxide is called ___

(e) Carbon monoxide is used as a ___ in the extraction of pure metals from their corresponding ores.

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