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What is the difference between rhombic …

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What is the difference between rhombic sulphur and monoclinic sulphur..?

Posted by Nidhi Kalmodiya 4 years, 5 months ago

CBSE > Class 12 > Chemistry

2 answers

Yogita Ingle 4 years, 5 months ago

Rhombic sulphur (α-sulphur)

Rhombic sulphur is crystalline in nature and has octahedral shape. On heating the solution of roll sulphur in CS2 we get rhombic sulphur. It is yellow with a melting point of 385.8K and specific gravity 2.06. Rhombic sulphur cannot be dissolved in water but can be dissolved in benzene, ether, alcohol etc.

Monoclinic sulphur (β-sulphur)

When we take a dish and melt rhombic sulphur in that dish we obtain monoclinic sulphur after cooling it. In this process we make two holes in the crust and pour out the remaining liquid. After this we get colourless needle-shaped crystals of β-sulphur when the crust is removed.

Gaurav Seth 4 years, 5 months ago

Rhombic sulfur (α-sulfur)	Monoclinic sulfur (β- sulfur)
1. It is a pale yellow coloured solid.	1. It is bright yellow solid
2. It forms orthorhombic crystals	2. It forms needle-shaped monoclinic crystals
3. Its melting point is 385.8 K.	3. Its melting point is 393 K.
4. Its density is 2.06 g/cm³	4. Its density is 1.98 g/cm³
5. It is insoluble in water and soluble in CS₂	5. Soluble in CS₂
6. It is stable below 369 K and transforms to β-sulfur above this temperature	6. It is stable above 369 K and transforms into α-sulfur below this temperature.
7. It is prepared by the evaporation of rolls sulfur in CS₂.	7. It is prepared from rhombic sulfur.

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