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(B) The two most abundant elements in the Earth's crust are oxygen and silicon. The compound $(A)$ formed by these elements is silicon dioxide $(SiO_2

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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 compound $(A)$ formed by these elements is silicon dioxide $(SiO_2)$,which is widely used in building construction (e.g.,in sand and concrete).When silicon dioxide $(SiO_2)$ reacts with carbon at high temperatures,it undergoes a reduction reaction:$SiO_2 + 3C \xrightarrow{\Delta} SiC + 2CO$Here,$(B)$ is carbon monoxide $(CO)$,which is a poisonous,stable diatomic gas.

Material	Application
$A$. Silicones	$i$. As a catalyst
	$ii$. Greases
$B$. Zeolites	$iii$. In surgical implants
	$iv$. As ion exchangers

An inorganic compound $(A)$ made of the two most abundant elements in the Earth's crust is used in building construction. When $(A)$ reacts with carbon,it forms a poisonous gas $(B)$,which is a very stable diatomic molecule. Identify compounds $(A)$ and $(B)$.

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$A$. Silicones $i$. As a catalyst
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