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Why is helium used in diving apparatus?...

Why is helium used in diving apparatus?

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Air contains a large amount of nitrogen and the solubility of gases in liquids increases with increase in pressure. When sea divers dive deep into the sea, large amount of nitrogen dissolves in their blood. When they come back to the surface, solubility of nitrogen decreases and it separates from the blood and forms small air bubbles. This leads to a dangerous medical condition called bends. Therefore, air in oxygen cylinders used for diving is diluted with helium gas. This is done as He is sparingly less soluble in blood.
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Assertion (A): Helium used in diving apparatus. Reason (R): Helium is very less soluble in blood.

(a) Account for the following : (i) Helium is used in diving apparatus. (ii) Fluorine does not exhibit positive oxidation state. (iii) Oxygen shows catenation behaviour less than sulphur. (b) Draw the structures of the following molecules. (i) XeF_2 (ii) H_2S_2O_8

(a) Complete the following equations : PCl_(5)overset("heat")rarr (ii) C+"Conc."H_(2)SO_(4)rarr (b) Explain giving reason in each case : (i) Halogens are strong oxidising agents. (ii) Fluorine form only one oxoacid, HOF. (iii) Helium is used in diving apparatus.

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NCERT-THE P-BLOCK ELEMENTS-EXERCISE
  1. Name two poisonous gases which can be prepared from chlorine gas.

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  2. Why is ICI more reactive than I2?

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  3. Why is helium used in diving apparatus?

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

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

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

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

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

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

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

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  11. How is ammonia manufactured industrially?

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

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

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

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

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

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  17. Nitrogen exists as diatomic molecule and phosphorus as P(4). Why ?

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  18. Write main differences between the properties of white phosphorus and ...

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  19. Why does nitrogen show catenation properties less than phosphorus.

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  20. Give the disproportionation reaction of H3PO3.

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