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Standard XII

Chemistry

Graphite

Which among t...

Question

Which among the following statements is not correct for Graphite ?

It is a non metal

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It can be used as a lubricant

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Each carbon atom is linked into a three- dimensional network with four other carbon atoms with strong covalent bonds.

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It has low melting point

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Solution

The correct option is A It has low melting point
Graphite is an allotrope of Carbon non-metal.It can be used as a lubricant.
Each carbon atom uses three of its electrons to form simple bonds to its three close neighbours. That leaves the fourth electron in the bonding level. These "spare" electrons in each carbon atom become delocalized over the whole of the sheet of atoms in one layer. They are no longer associated directly with any particular atom or pair of atoms but are free to wander throughout the whole sheet.

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Similar questions

Which of the following statement(s) is/are correct about carbon compounds?

(i) Carbon has the ability to form covalent bonds with other atoms of carbon giving rise to a large number of molecules through a self-linking property.

(ii) Carbon compounds do not show isomerism.

(iii) Carbon compounds are highly unstable compounds.

(iv) Carbon compounds have low melting and boiling points.

Q. Which of the following statement is true for graphite?

(a) In graphite, each carbon atom is bonded to four other carbon atoms.
(b) Graphite is very hard.
(c) It is a good conductor of electricity.
(d) It is a bad conductor of electricity.

Choose the correct alternative :

(a) In a combined state, carbon occurs as

(i) coal

(ii) diamond

(iii) graphite

(iv) petroleum

(b) A crystalline form of carbon is

(i) lamp black

(ii) gas carbon

(iii) sugar

(iv) fullerene

(i) Bihar

(ii) Maharashtra

(iii) Orissa

(iv) Rajasthan

(d) Diamond is used for

(i) making the electrodes of electric furnaces.

(ii) making crucible for melting metals.

(iii) cutting and drilling rocks and glass.

(iv) making carbon brushes for electric motors.

(e) Carbon forms innumerable compounds because

(i) it has four electrons in its outermost shell.

(ii) it behaves as a metal as well as a non-metal.

(iii) carbon atoms can form long chains.

(iv) it combines with other elements to form covalent compounds.

Q. Consider the following statements
I : In diamond, each carbon atom is linked tetrahedrally for four other carbon atoms by

{s p}^{3}

bonds.
II : Graphite has planar hexagonal layers of carbon atoms held together by weak Van der Waal's forces.
III : Silicon exists only in diamond structure due to its tendency to form

p π - p π

bonds to itself.

In this -

A carbon atom is tetravalent, I.e. it can form four covalent bonds.

Which of the following bonds are possible between two carbon atoms?

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