Monoclinic sulphur melts to clear mobile liquid at 119 ° C but on further heating to 160 ° C to 190 ° C , it becomes viscous. Also at 200 ° C , the viscosity again decreases, Explain.

In solid form, sulphur is made up of ring-shaped molecules of eight sulphur atoms. As the temperature increases, the sulphur starts to melt. At this point, the rings slide over each other simply because of which the liquid is movable. As the temperature is increased to 160 ° C , the ring-shaped molecules break and the chains of sulphur atoms mesh with each other, this makes the liquid seems to be viscous. Above 200 ° C , the polymer chain begins to fragment in smaller pieces and thus viscosity decreases.

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The extraction of is done by the Frasch process.

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Important Questions on p-Block Elements

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

A mixture of

3 g

of sulphur and

12.7 g

of copper was placed in a quartz tube. The tube was sealed under vacuum and then heated to the melting. The cooled tube contains

HARD

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Explain the Frasch process for the extraction of sulphur with the help of a labelled diagram.

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

The products

P

and

Q

of the following reaction, respectively, are

a S_{8} (s) + bNaOH (aq) ⟶ P (aq) + qQ (aq) + {rH}_{2} O

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Name the allotrope of sulphur that is stable at room temperature.

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Which state of sulphur exhibits paramagnetism and why?

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Match the following

Column - 1

Type of sulphur

Column - 2

Property

(A)

α

- Sulphur
(B)

S_{2}

(C)

β

- Sulphur

(I) soluble in

{CS}_{2}

(II) soluble in

H_{2} O

(III) Puckered ring
(IV) Paramagnetic
(V) Chair form

The correct match is:

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

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 II : 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:

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Draw the structure of

S_{8}

molecule.

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Which among the following statements are correct?
(a) Rhombic sulphur transforms to monoclinic sulphur when heated above

369 K

.
(b) Solution of roll sulphur in

{CS}_{2}

, on evaporation gives the crystals of rhombic suiphur.
(c) Both rhombic and monoclinic sulphur have

S_{8}

molecules.
(d) Both rhombic and monoclinic sulphur are soluble in carbon disulphide.

HARD

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

How is rhombic sulphur prepared?

HARD

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Give any three properties of rhombic sulphur.

HARD

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Monoclinic sulphur is stable above

369 K

and transforms into

α -

sulphur below it.

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Monoclinic sulphur melts to clear mobile liquid at

119 ° C

but on further heating to

160 ° C

190 ° C,

it becomes viscous. Also at

200 ° C,

the viscosity again decreases, Explain.

HARD

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Explain briefly about rhombic sulphur.

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

How the atoms of sulphur are arranged in its molecule? Show by a diagram.

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Represent the union of two sets by Venn diagram for each of the following.

$X = {x | x$ is a prime number between $80$ and $100}$

$Y = {y | y$ is an odd number between $90$ and $100}$

MEDIUM

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Sulphur can form $S_{2}, S_{6}, S_{8}$ and $S_{n}$ but oxygen forms only $O_{2}$ and $O_{3} .$ This is due to

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Correct statements about allotropy ?

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Which of the following elements shows the highest number of allotropes?

EASY

Chemistry>Inorganic Chemistry>p-Block Elements>Sulphur

Identify the mismatch.

The extraction of is done by the Frasch process.

Important Questions on p-Block Elements

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