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Why is helium used in diving apparatus ?...

Why is helium used in diving apparatus ?

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Helium along with oxygen is used in the diving apparatus by the sea divers. Since it is very little soluble in blood, it reduces decompression and causes less discomfort to the diver in breathing. For more details, consult unit 2 (on solutions).
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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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DINESH PUBLICATION-THE P-BLOCK ELEMENTS -N.C.E.R.T In-Text Questions
  1. Why is H(2)O a liquid and H(2)S a gas ?

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

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  3. Complete the following reactions : (i) C(2)H(4)+O(2) to (ii) Al +O...

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

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  5. How is O(3) estimated quantitatively ?

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  6. What happens when sulphur dioxide gas is passed through an aqueous sol...

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

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  8. How is the presence of SO2 detected?

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

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  10. Write the conditions to maximise the yield of H2SO4 by contact process...

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  11. If osmotic pressure of 1M aqueous solution of H(2)SO(4) at 500K is 90....

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  12. Considering the parameters such as bond dissociation enthalpy, electro...

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  13. Give two examples to show the anomalous behaviour of fluorine.

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

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  15. Give reason for the bleaching action of Cl(2).

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

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  17. Why is Icl more reactive than I(2) ?

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  18. Why is helium used in diving apparatus ?

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  19. Balance the equation : XeF(6)+H(2)O to XeO(2)F(2)+HF

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

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