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Account for the following: Helium is ...

Account for the following:
Helium is used in diving apparatus.

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Helium is used in diving apparatus because it acts as a diluent for oxygen because of its very low solubility in blood.
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(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

Why is helium used in diving apparatus ?

Why is helium used in diving apparatus?

(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.

Assign reason to the following : Helium is used by scuba divers.

U-LIKE SERIES-THE P-BLOCK ELEMENTS -LONG ANSWER QUESTION-II
  1. Which noble gas is used in filling balloons for meteorological observa...

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  2. Complete the equation : XeF2 + PF5 to

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  3. Account for the following: Helium is used in diving apparatus.

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  4. Account for the following: Fluorine does not exhibit positive oxida...

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  5. Account for the following: Oxygen shows catenation behaviour less t...

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  6. Draw the structures of the following molecules : (i) XeF2 (ii) H2S2...

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  7. Complete the following chemical equations : Cu + HNO3 ( dilute) to

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  8. Complete the following chemical equations : XeF4 + O2F2 to

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  9. Explain the following observations: Phosphorus has greater tendency ...

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  10. Explain the following observations: Oxygen is a gas but sulphur is a...

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  11. Explain the following observations: The halogens are coloured. Why?

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  12. Explain the following: NF3 is an exothermic compound whereas NCl3 i...

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  13. Explain the following: F2 is most reactive of all the four common h...

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  14. Complete the following chemical equations : C + H2SO4 (conc. ) to

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  15. Complete the following chemical equations : P4 + NaOH + H2O to

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  16. Complete the following chemical equations : Cl2 + F2 underset("(exce...

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  17. Account for the following: The acidic strength decreases in the ord...

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  18. Account for the following: Tendency to form pentahalides decreases ...

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  19. Complete the following chemical equations : P4 + SO2Cl2 to

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  20. Complete the following chemical equations : XeF2 + H2O to

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