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Standard XII

Chemistry

Bond Length

Given below a...

Question

Given below are two statements:

Statement $I :$ $α$ and $β$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling.

Statement $I I :$ At room temperature the stable crystalline form of sulphur is monoclinic sulphur.

In the light of the above statements, choose the correct answer from the options given below.

Both statement

I

and statement

I I

are false

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Statement

I

is true but statement

I I

is false

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Both statement

I

and statement

I I

are true

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Statement

I

is false but statement

I I

is true

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Solution

The correct option is B Statement $I$ is true but statement $I I$ is false
At $369 K$ , both the forms are in equilibirum with each other.
$\begin{matrix} S_{Rhombic} & 369 K ⇋ & S_{Monoclinic} (α - sulphur) & (β - sulphur) \end{matrix}$

At room temperature , the rhombic sulphur is the most stable.

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The correct option is B Statement I is true but statement II is falseAt 369 K, both the forms are in equilibirum with each other. SRhombic369 K⇋SMonoclinic(α−sulphur)(β−sulphur) At room temperature , the rhombic sulphur is the most stable.