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Why is helium used in diving apparatus ?...

Why is helium used in diving apparatus ?

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Atomic hydrogen and oxy-hydrogen torches generate very high temperature of 4000K. So dihydrogen is used in welding of high melting metals.
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VGS PUBLICATION-BRILLIANT-HYDROGEN AND ITS COMPOUNDS -Long Answer Questions
  1. Why is helium used in diving apparatus ?

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  2. Write an essay on the commericial preparation of dihydrogen. Give bala...

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  3. Illustrate the chemistry of dihydrogen by its reaction with (i) N(2)

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  4. Illustrate the chemistry of dihydrogen by its reaction with (b) Meta...

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  5. Illustrate the chemistry of dihydrogen by its reaction with (c ) Org...

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  6. Explain, with suitable examples, the following: (i) Electron-deficie...

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  7. Explain, with suitable examples, the following: (ii) Electron - prec...

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  8. Explain, with suitable examples, the following: (iii) Electron-rich ...

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  9. Write in brief on (i) ionic hydrides

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  10. Write in brief on (ii) interstitial hydrides.

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  11. Explain any four of the chemical properties of water.

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  12. Explain the terms hard water and soft water. Write a note on the (i)...

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  13. Explain the terms hard water and soft water. Write a note on the (ii...

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  14. Write the chemical reaction to justify that hydrogen peroxide can func...

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  15. Complete and balance the following chemical reactions: (i) PbS(s) + ...

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  16. Complete and balance the following chemical reactions: (ii) MnO(4)^(...

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  17. Complete and balance the following chemical reactions: (iii) CaO(s) ...

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  18. Complete and balance the following chemical reactions: (iv) Ca(3)N(2...

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  19. Discuss, with relevant chemical equations, various methods of preparin...

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  20. In how many ways can you express the strength of H(2)O(2)? Calculate t...

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  21. Explain the structure of Hydrogen peroxide molecule.

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