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Standard VIII

Chemistry

Allotropy

Carbon forms ...

Question

Carbon forms innumerable compounds because-

It has electrons in its outermost shell

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It behaves both as a metal and nonmetal

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It is stable

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It combines with other elements to form covalent bonds

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Solution

The correct option is D It combines with other elements to form covalent bonds
It forms a large number of bonds with other atoms. A single carbon can make four covalent bonds. A carbon atom can make long chains linking with other carbon atoms (catenation). Hence carbon can form innumerable compounds.

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Similar questions

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.

An atom X has 2,8,7 electrons in its shells. It combines with Y having 1 electron in its outermost shell. What type of bond will be formed between X and Y?

Why the compound BF₃is stable however after forming the covalent bond boron contain only 6 electrons instead of 8 in its outermost shell.

Q. An element

X

has

6

electrons in its outermost shell. Then the number of electrons shared by

X

with another atom to form a covalent bond is _______.

Q. Assertion :Carbon shows tetravalency in all carbon compounds. Reason: Carbon shares its four valence electrons with other atoms and forms four single covalent bonds to get the nearest noble gas configuration.

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