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Standard XII

Chemistry

Allotropes of Sulphur

Assertion :Ca...

Question

Assertion :Carbon has 2 crystalline forms. Reason: This is due to tetravalency of carbon.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
Carbon has 3 crystalline forms namely graphite, diamond and fullerene. Thus assertion is incorrect. Due to tetravalency of carbon it can exist in above mentioned crystalline allotropes.

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Similar questions

Assertion (A) Phenol forms 2, 4, 6-tribromophenol on treatment with $B r_{2}$ in carbon disulphide at 273K.
Reason (R) Bromine polarises in carbon disulphide.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

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.

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Assertion :Carbon has 2 crystalline forms. Reason: This is due to tetravalency of carbon.

The correct option is D Assertion is incorrect but Reason is correctCarbon has 3 crystalline forms namely graphite, diamond and fullerene. Thus assertion is incorrect. Due to tetravalency of carbon it can exist in above mentioned crystalline allotropes.

The correct option is D Assertion is incorrect but Reason is correct
Carbon has 3 crystalline forms namely graphite, diamond and fullerene. Thus assertion is incorrect. Due to tetravalency of carbon it can exist in above mentioned crystalline allotropes.