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List the important sources of sulphur....

List the important sources of sulphur.

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In the earth's crust, sulphur mainly occurs in the combined form as: 1. Sulphides: Galena (PbS), Copper pyrites `(CuFeS_(2))` , Iron pyrites `(FeS_(2))` , Zinc blende (ZnS) ,etc. 2. Sulphates: Gypsum `(CaSO_(4))`, Baryte `(BaSO_(4))`, Epsom salt `(MgSO_(4)cdot7H_(2)O)`, etc.
Traces of sulphur can be seen in proteins, eggs, onion, garlic, mustard, wool and hair in the form of `H_(2)S`.
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CHHAYA PUBLICATION-P-BLOCK ELEMENTS-SOLVED NCERT TEXTBOOK PROBLEMS
  1. Elements of group-16 generally show lower value of first ionisation en...

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  2. H(2)S less acidic than H(2)Te. Why?

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  3. List the important sources of sulphur.

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  4. Write the order of thermal stability of the hydrides of group-16 eleme...

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  5. Why is H(2)O a liquid and H(2)S a gas?

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  6. Which of the following does not react with oxygen directly? Zn, Ti, Pt...

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  7. Complete the following reactions: C(2)H(4)+O(2)to

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  8. Complete the following reactions: 4Al+3O(2)to

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  9. Why does O(3) act as a powerful oxidising agent?

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  10. How is O(3) estimated quantitatively?

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  11. Which form of S shows paramagnetic behaviour?

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  12. What happens when sulphur dioxide is passed through an aqueous solutio...

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  13. Comment on the nature of two S-O bonds formed in SO(2) molecule. Are t...

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  14. How is the presence of SO^(2) detected?

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  15. What happens when-Conc. H(2)SO(4) is added to calcium fluoride.

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  16. What happens when- SO(3) is passed through water.

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  17. Mention three areas in which H(2)SO(4) plays an important role.

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  18. Write the conditions to maximise the yield of H(2)SO(4) by Contact pro...

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  19. Why is K(a(2))ltltK(a(1)) for H(2)SO(4) in water?

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  20. Halogens have maximum negative electron gain enthalpy in the respectiv...

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