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Rhombic sulphur has a eight membered puckered ring structure On heating ring tends to break and linear chain sulphur tends to formed.Molten sulphur at 119°C exists as S 8 ring which roll over one another Hence it is mobile. Above 160°C rings are cleaved and the resulting open chains tangle together with the result sulphur becomes viscous.

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The p-Block Elements

Short Answer Type

451. Why is sulphuric acid a good dehydrating agent?

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452. What happens when conc. H₂SO₄ is slowly added to cane sugar?

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453. Which form of sulphur shows paramagnetic behaviour?

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454. What happens when
(i) Concentrated H₂SO₄ is added to calcium fluoride
(ii) SO₃ is passed through water?

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455. Why ozone is more reactive than oxygen?

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456. Sulphur melts to clear mobile liquid at 119°C, but on further heating above 160°C, it becomes viscous. Why?

Rhombic sulphur has a eight membered puckered ring structure On heating ring tends to break and linear chain sulphur tends to formed.Molten sulphur at 119°C exists as S₈ ring which roll over one another Hence it is mobile. Above 160°C rings are cleaved and the resulting open chains tangle together with the result sulphur becomes viscous.

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