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Supar turns black on adding with sulphur...

Supar turns black on adding with sulphuric acid. Why? 

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AAKASH SERIES-GROUP 16 ELEMENTS-EXERCISE - 2.2
  1. Nitric acid can not be used to prepare hydrogen sulphide. Why?

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  2. The bond angle in water molecule is nearer to tetrahedral angle, but i...

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  3. Discuss the structures of sulphite and sulphate ions.

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  4. What is ozonolysis? Write equation for the ozonolysis of ethylene. Dra...

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  5. Ozone acts as oxidising agent as well as reducing agent. Substantiate.

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  6. Hydrogen sulphide can not be dried over conc. H(2)SO(4) Why?

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  7. How many sulphur atoms in H(2)S(n)O(6) has sulphur linked to only its ...

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  8. Turbidity is obtained when hydrogen sulphide is passed through aqueous...

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  9. Compared to water, hydrogen sulphide is thermally less stable, stronge...

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  10. Supar turns black on adding with sulphuric acid. Why?

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  11. Ozone destroys mercury meriscus. Why?

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  12. Water should not be added to cone acid while preparing dilute sulphuri...

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  13. Chlorination of a gas X with chlorine gives a substance Y. Y is used t...

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  14. Sulphuric acid is manufactured in contact process, but some amount of ...

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  15. In the reaction of ozone with potash an orange red solid is formed. Wh...

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  16. Sulphurous acid turns pink permanganate colourless and turns acidified...

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  17. An aqueous solution of a gas (G) decolourises acidified permanganate a...

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  18. An aqueous solution of silver nitrate gives a white precipitate with

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  19. An inorganic solid (A) dissolve in watger to give acid B and acid C. A...

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  20. Na(2)CO(3)+SO(2)overset(Delta)rarr A+B,B+S rarr C and C +2AgNO(3)ra...

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