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Why is H(2)O a liquid and H(2)S a gas ?...

Why is `H_(2)O` a liquid and `H_(2)S` a gas ?

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In `H_(2)O`, the electronegativity difference between O(3.5) and H(2.1) is more than difference between S(2.5) and H(2.1) in `H_(2)S`. As a result. O-H bond is more polar than S-H bond. This leads to inter molecular hydrogen bonding in `H_(2)O` molecules while it is almost absent in the molecules of `H_(2)S`. The `H_(2)O` molecules get associated and consequently exist as liquid (water). The association is `H_(2)S` molecules is negligible and it exists as a gas at room temperature.
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DINESH PUBLICATION-THE P-BLOCK ELEMENTS -N.C.E.R.T In-Text Questions
  1. List the important sources of sulphur.

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  2. Write the order of the thermal stability of the hydrides of group 16 e...

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  3. Why is H(2)O a liquid and H(2)S a gas ?

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  4. Which of the following does not react with oxygen directly? Zn,Ti,Pt,F...

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  5. Complete the following reactions : (i) C(2)H(4)+O(2) to (ii) Al +O...

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  6. Why does O(3) act as a powerful oxidising agent ?

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  7. How is O(3) estimated quantitatively ?

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  8. What happens when sulphur dioxide gas is passed through an aqueous sol...

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  9. Comment on the nature of two S-O bonds formed in SO(2) molecule. Are t...

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  10. How is the presence of SO2 detected?

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  11. Mention three areas in which H(2)SO(4) plays an important role.

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  12. Write the conditions to maximise the yield of H2SO4 by contact process...

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  13. If osmotic pressure of 1M aqueous solution of H(2)SO(4) at 500K is 90....

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  14. Considering the parameters such as bond dissociation enthalpy, electro...

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  15. Give two examples to show the anomalous behaviour of fluorine.

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  16. Sea is the greatest source of some halogens. Comment.

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  17. Give reason for the bleaching action of Cl(2).

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  18. Name two poisonous gases which can be prepared from chlorine gas.

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  19. Why is Icl more reactive than I(2) ?

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  20. Why is helium used in diving apparatus ?

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