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(B) The two most abundant elements in the earth's crust are oxygen and silicon. The inorganic compound $(A)$ with a polymeric tetrahedral network stru

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$SiO_2, CO$

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(B) The two most abundant elements in the earth's crust are oxygen and silicon. The inorganic compound $(A)$ with a polymeric tetrahedral network structure is silica,$SiO_2$.When $SiO_2$ reacts with carbon at high temperatures,it produces silicon and carbon monoxide gas:$SiO_2 + 2C \rightarrow Si + 2CO$Compound $(B)$ is carbon monoxide $(CO)$,which is a poisonous gas and is known to be the most stable diatomic molecule due to its high bond dissociation energy.Therefore,the compounds are $(A) = SiO_2$ and $(B) = CO$.

An inorganic compound $(A)$ made of the two most occurring elements in the earth's crust,having a polymeric tetrahedral network structure. With carbon,compound $(A)$ produces a poisonous gas $(B)$ which is the most stable diatomic molecule. Compounds $(A)$ and $(B)$ are:

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