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431. The tendency to show-2 oxidation state diminishes from S to Po. Why?

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432. Why does oxygen not show an oxidation state of + 4 and + 6 like sulphur?

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433. Give one example each of the oxoacids of phosphorus in which the P has the oxidation state of (i) + 4 (ii) + 3.

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434. Name all the elements of group 16. Which elements is radioactive?

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435. Why are group 16 elements called chalcogens?

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436. Give two important uses of Selenium.

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437. Name two allotrope of sulphur. Which allotrope is stable at room temperature?

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438. Which allotrope of selenium coducts electricity?

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439. Why does sulphur in vapour state exhibit paramagnetic behaviour?

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440. Why are group 16 elements called polymorphic elements?

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