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Which noble gas is used along with O2 fo...

Which noble gas is used along with `O_2` for respiration by sea divers ?

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USHA PUBLICATION-P-BLOCK ELEMENTS( GR-15,GR16,GR17,GR18)-EXERCISE
  1. Write four characteristic properties of noble gases.

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  2. Why is neon used in beacon light ?

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  3. Which noble gas is used along with O2 for respiration by sea divers ?

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  4. What happens when Nal is heated with conc. H2SO4 ?

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  5. Oxygen exists as O2 while sulphur exists as S8,although they belong to...

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  6. What happens when Cl2 gas is passed through dry slaked lime?

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  7. Why HF cannot be stored in glass bottle ?

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  8. Give one example of each in which SO2 acts as reductant and oxidant re...

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  9. Why is oxygen a gas sulphur a solid at while room temperature ?

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  10. Explain why CIF3 exists where as FCI3 does not.

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  11. What happens when Cl2 gas is passed through a solution of NaI?

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  12. What is aqua regia? What is its use ?

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  13. For dilution of H2SO4,H2O should not be added to conc. H2SO4. Give the...

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  14. Explain why bond angle in H2S is lower than in H2O ?

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  15. A mixture of three gases A, B, C is passed first through acidified K2C...

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  16. Why do noble gases have comparatively large atomic size in a particula...

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  17. Why are halogens coloured ?

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  18. Arrange H2O,H2S,H2Se,H2Te in order of increasing thermal stability.

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  19. How does ozone react with silver metal ?

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  20. What happens when PbS is treated with ozone ?

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