Silicon is an important constituent of

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(A) Silicon is an important constituent of rocks in the form of silica $(SiO_2)$ and silicates.$A$. Rocks: Silicon is a major component of the Earth's

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Rocks

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(A) Silicon is an important constituent of rocks in the form of silica $(SiO_2)$ and silicates.$A$. Rocks: Silicon is a major component of the Earth's crust in the form of silica and silicates.$B$. Amalgams: These are alloys of mercury $(Hg)$ with other metals.$C$. Chlorophyll: This pigment contains magnesium $(Mg)$ at its center.$D$. Haemoglobin: This protein contains iron $(Fe)$ as its central metal ion.

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