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Name two scientists associated with disc...

Name two scientists associated with discovery of noble gasses.

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USHA PUBLICATION-P-BLOCK ELEMENTS( GR-15,GR16,GR17,GR18)-EXERCISE
  1. What is called fourth state of matter ?

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  2. Arrange the noble gases in increasing order of the case liquification.

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  3. Name two scientists associated with discovery of noble gasses.

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  4. What is the bond angle in SO2 molecule ?

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  5. Why do the Gr-18 elements not form compounds under ordinary conditions...

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  6. Why has it been difficult to study chemistry of radon ?

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  7. Acidified K2Cr2O7 solution changes to when SO2 gas is passed through i...

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  8. What is the shape of ozone molecule ?

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  9. Name two poisonous gases which can be prepared from Cl2.

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  10. H2O is a liquid while hydrogen sulphide is a gas at room temperature....

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  11. Write all the members of halogen family.

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

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  13. Which noble gas is called as Hidden gas ?

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  14. Presence of Helium in earth was Ist proved by .

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  15. What is composition of Oleum ?

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  16. What is the role of MnO2 in the preparation of Cl2 from HCI?

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  17. Explain why the ionisation energy of nitrogen is more than that of oxy...

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  18. Write the equation for the reaction between CI2 and dil. NaOH solution...

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  19. Name the process employed for manufacture of NH3 from N2 and H2 .

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  20. Magnesium nitride on bolling with water forms .

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