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Byju's Answer

Standard XII

Chemistry

Graphite

Assertion :Gr...

Question

Assertion :Graphite conduct electricity well in a direction parallel to the planes of hexagons, but not a tall well in a direction perpendicular to the planes Reason: In graphite $s p^{2}$ hybridisation and due to presence of free electron they are good conductor of electricity in a layer but not so good in between two layers.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Graphite conduct electricity well in a direction parallel to the planes of hexagons, but not a tall well in a direction perpendicular to the planes, because in graphite $s p^{2}$ hybridisation and due to the presence of free electron they are good conductor of electricity in a layer but not so good in between two layers.

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Similar questions

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices.

(a) Assertion and Reason both are correct statements an Reason is correct explanation for Assertion.

(b) Assertion and Reason both are correct satements but Reason is not correct explanation for Assertion.

(d) Assertion is wrong statement but Reason is correct statement.

Assertion (A) Graphite is a good conductor of electricity however diamond belongs to the category of insulators.

Reason (R) Graphite is soft in nature on the other hand diamond is very hard and brittle.

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

{2n}^{2}

electrons.

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

Q. Assertion:

\to A \times \to B

is perpendicular to both

\to A + \to B

as well as

\to A - \to B .

Reason:

\to A + \to B

as well as

\to A - \to B

lie in the plane containing

\to A

and

\to B

but

\to A \times \to B

lies perpendicular to the plane containing

\to A

and

\to B .

Assertion (A) The enthalpy of reaction remains constant in the presence of a catalyst.

Reason (R) A catalyst participating in the reaction forms different activated complex and lowers down the activation energy but the difference in enrgy of reactant and product remains the same.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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