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Why is helium used in diving apparatus ?...

Why is helium used in diving apparatus ?

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Because of its low solubility (as compared to `N_(2)`) in blood, a mixture of oxygen and helium is used in diving apparatus used by deep sea divers.
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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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Nitrogen is normally used to maintain an inert atmosphere in metallurgical operations. Why is helium used for the reduction of TiCl_(4) with Mg metal ?

PRADEEP-P-BLOCK ELEMENTS -NCERT QUESTIONS AND EXERCISES WITH ANSWERS
  1. Name two poisonous gases which can be prepared from chlorine gas.

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  2. Why is ICl more reactive than I(2) ?

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  3. Why is helium used in diving apparatus ?

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  4. Balance the following equation : XeF(6) + H(2)O rarr XeO(2)F(2) + 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 NH(3) form hydrogen reactivity of group 15 elements.

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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 R(3)P=O exist but R(3)N=O does not (R is an 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 phospghorus and...

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

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  20. Give the disproportionation reaction of H(3)PO(3).

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