a) Write the chemical formula of calcium carbonate.
b) Which gas is formed when calcium carbonate reacts with acids?

c) Graphite, which is an allotrope of carbon, is a conductor of electricity. But diamond, another allotrope, is not a conductor of electricity. Why?

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Solution

a) The chemical formula of calcium carbonate is $C a C O_{3}$ .

b) Calcium carbonate reacts with acidic solutions to produce carbon dioxide gas.

$C a C O_{3} + 2 H C l \to C a C l_{2} + C O_{2} + H_{2} O$

c) In a graphite molecule, one valence electron of each carbon atom remains free, Thus making graphite a good conductor of electricity. Whereas in diamond, they have no free mobile electrons. Hence there won't be flow of electrons. That is why diamonds are bad conductors of electricity.

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Similar questions

{s p}^{3}

{s p}^{2}

One of the following is not an allotrope of carbon. This is :
(a) diamond (b) graphite (c) cumene (d) buckminsterfullerene

Answer the following questions.

(a) What is meant by allotrope? Which are the allotropes of carbon?

(b) How is carbon dioxide gas produced in the laboratory?

(d) How is charcoal made?

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