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Give the uses of helium ....

Give the uses of helium .

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(i) Helium and oxygen mixture is used by divers in place of air oxygen mixture. This prevents the painful dangerous condition called bends.
(i) Helium is used to provide inert atmosphere in electric arc welding of metals.
(iii) Helium has lowest boiling point hence used in cryogenics (low temperature science).
(iv) It is much less denser than air and hence used for filling air balloons.
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SURA PUBLICATION-P-BLOCK ELEMENTS - II-EVALUATION (ANSWER THE FOLLOWING QUESTIONS )
  1. What are interhalogen compounds ? Give examples .

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  2. Why fluorine is more reactive than other halogens ?

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  3. Give the uses of helium .

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  4. What is the hybridisation of iodine in IF(7) ? Give its structure .

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  5. Give the balanced equation for the reaction between chlorine with col...

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  6. How will you prepare chlorine in the laboratory ?

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  7. Give the uses of sulphuric acid .

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  8. Give a reason to support that sulphuric acid is a dehydrating agent.

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  9. Write the reason for the anamolous behaviour of nitrogen .

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  10. Write the molecular formula and structural formula for the following ...

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  11. Give the uses of argon.

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  12. Write the valence shell electronic configuration of group-15 elements.

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  13. Give the equations to illustrate the chemical behaviour of phosphine .

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  14. Give a reaction between nitric acid and a basic oxide.

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  15. What happens when PCl(5) is heated ?

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  16. Why is boric acid considered as a weak acid ?

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  17. Deduce the oxidation number of oxygen in hypofluorous acid - HOF.

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  18. Hybridisation and shape of BrF(5) is :

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  19. Complete the following reactions . NaCl+MnO(2)+H(2)SO(4) rarr

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  20. Complete the following reactions . NaNO(2)+HCl rarr

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