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(a) Elements of group 16 generally show ...

(a) Elements of group `16` generally show lower value of first ionisation enthalpy as compared to the corresponding periods of group `15`. Why ?
(b) `H_2 S` is less than acidic than `H_2 Te`. Why ?

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Due to the decrease in bond (E–H) dissociation enthalpy down the group, acidic character increases.
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NCERT ENGLISH-THE P-BLOCK ELEMENTS-EXERCISE
  1. (a) Elements of group 16 generally show lower value of first ionisatio...

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  2. Why are pentahalides more covalent than trihalides?

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  3. Why is BiH3 the strongest reducing agent amongst all the hydrides of g...

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  4. Why is N(2) less reactive at room temperature ?

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  5. Mention the conditions required to maximise the yield of ammonia.

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  6. How does ammonia react with a solution of Cu(2)^(+)?

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  7. What is the covalence of nitrogen in N2O5?

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  8. Bond angle in PH(4)^(+) is higher than that in PH(3).Why ?

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  9. (a)What happens when white phosphorus is heated with concentrated NaOH...

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  10. What happens when (A)PCl(5) is heated. (B)PCl(5) is reacted with h...

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  11. Write a balanced equation for the hydrolytic reaction of PCl5 in heavy...

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  12. What is the basicity of H(3)PO(4) ?

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  13. What happens when (A)PCl(5) is heated. (B)PCl(5) is reacted with h...

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  14. List the important sources of sulphur.

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  15. Write the order of thermal stability of the hydrides of group 16 eleme...

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

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

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

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  19. Why does O3 act as a powerful oxidising agent?

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  20. How is O(3) estimated quantitatively ?

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  21. What happens when sulphur dioxide is passed through an aqueous solutio...

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