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Sea is the greatest source of some halog...

Sea is the greatest source of some halogens. Comment.

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Sea water contains chlorides, bromides, and iodides of Na, K, Mg, and Ca. However, it primarily contains NaCl. The deposits of dried up sea beds contain sodium chloride and carnallite, `KCl.MgCl_(2).6H_(2)O`. Marine life also contains iodine in their systems. For example, sea weeds contain upto`0.5%` iodine as sodium iodide. Thus, sea is the greatest source of halogens.
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NCERT-THE P-BLOCK ELEMENTS-EXERCISE
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  2. Give two examples to show the anomalous behavious of fluorine.

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  3. Sea is the greatest source of some halogens. Comment.

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  4. Give the reason for bleaching action of Cl2.

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  5. Name two poisonous gases which can be prepared from chlorine gas.

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  6. Why is ICI more reactive than I2?

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  7. Why is helium used in diving apparatus?

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  8. Balance the following equation: XeF6+H2OtoXeO2F2+HF

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  9. Why has it been difficult to study the chemistry of radon?

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  10. Discuss the general characteristics of Group 15 elements with referenc...

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  11. Why does the reactivity of nitrogen differ from phosphorus?

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  12. Discuss the trends in chemical reactivity of group 15 elements.

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  13. Why does NH3 form hydrogen bond but PH3 does not?

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  14. How is nitrogen prepared in the laboratory? Write the chemical equatio...

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  15. How is ammonia manufactured industrially?

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  16. Illustrate how copper metal can give different product on reaction wit...

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  17. Give the resonating structures of NO(2) and N(2)O(5).

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  18. The HNH angle value is higher than HPH, HAsH and HSbH angles. Why?

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  19. Why does R3P=O exist but R3N=O does not (R= alkyl group)?

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  20. Explain why NH(3) is basic while BiH(3) is only feebly basic ?

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