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Mention the uses of helium ....

Mention the uses of helium .

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(i) Because of its lightness and non-inflammability helium is used to filling balloons for meteorological observations.
(ii) Because of its lightness it is used in inflating aeroplane tyres.
(iii) Helium oxygen mixture is used by deepsea divers in preference to nitrogen oxygen mixtures, This prevents "bends" when a diver comes to the surface.
(iv) A mixture of oxygen and helium is used in the treatment of asthma.
(v) Liquid helium (b.pt 4.2 K) is used as cryogenic agent for carrying out various experiments at low temperatures.
(vi) It is used to produce and sustain powerful super conducting magnets of modern NMR Spectrometers and Magnetic Resonance Imaging system (MRI) for clinical diagnosis.
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SURA PUBLICATION-P-BLOCK ELEMENTS - II-ADDITIONAL QUESTIONS AND ANSWERS (LONG ANSWER)
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  2. Explain the structure of inter halogen compounds.

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  3. Mention the uses of helium .

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  4. Give a detailed account on allotropes of sulphur.

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  5. Why is dioxygen a gas but sulphur a solid ?

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  6. Complete the following reactions : KClO(3) rarr ?

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  7. Complete the following reactions : ZnS +O(2) rarr ?

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  8. Complete the following reactions : Al(2)O(3)+NaOH+H(2)Orarr ?

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  9. Complete the following reactions : NaOH +SO(2) rarr ?

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  10. Complete the following reactions : KCl+H(2)SO(4) rarr ?

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  11. An amorphous solid (A) burns in air to form a gas (B) which turns lime...

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  12. Give reason for the following : N(2)O(5) is more acidic than N(2)O...

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  13. Give reason for the following : Thermal stability decreases from H(...

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  14. Give reason for the following : Fluoride ion has higher hydration e...

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  15. Account for the following : Reducing character decreases from SO(2)...

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  16. Account for the following : Xenon forms compounds with fluorine and ...

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  17. Complete the following equations : 4NaCl+MnO(2)+4H(2)SO(4)rarr ?

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  18. Complete the following equations : 6XeF(4)+12H(2)O rarr ?

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  19. Explain the oxidising and reducing property of SO(2).

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  20. How is sulphuric acid manufacture by contact process ?

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