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Why is helium used in diving apparatus?...

Why is helium used in diving apparatus?

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It is used as an diluent for oxygen in modern diving apparatus because of its very low solubility in blood.
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V PUBLICATION-The p-BLOCK ELEMENTS-QUESTION BANK
  1. Name two poisonous gases that can be prepared from chlorine gas

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  2. Why is ICl more reactive than I2 ?

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  3. Why is helium used in diving apparatus?

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  4. Balance the following equation: 'XeF6 + H2O -> XeO2F2 +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 NH3 form hydrogen bond but 'PH3 does not?

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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 products on reaction wi...

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  13. Give the resonating structures of NO2 and N2 O5

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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 R3P=0 exist but R3N=0 does not. [R = alkyl group]?

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  16. Explain why 'NH3', is basic. while 'BiH3 is only feebly basic.

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  17. Nitrogen exists as diatomic molecule and phosphorus as 'P4'. Why?

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  18. Write main differences between the properties of white phosphorus and ...

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  19. Why does nitrogen show catenation properties less than phosphourus?

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  20. Give the-disproportionation reaction of 'H3 PO3'

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