Question

Question 9.33 What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15, 19, 23 and 44 with dihydrogen?
Compare their behaviour towards water.

Class XI Hydrogen Page 290

Answer 1

(i) element with Z = 15 is a non-metal (e.g., phosphorus) so, it forms covalent hydride e.g., PH3

(ii) element with Z = 19 is an alkali metal {e.g., potassium}.so,it froms ionic Hydride e.g.,KH

(iii) element with atomic number Z = 23 is a transition metal {e.g.,venedium } so, it forms metallic Hydride or interstitial Hydride e.g.,VH₀.₅₆

(iv) element with Z = 44 is a transition metal {e.g., Ruthenium} of group 8 and hence it doesn't form any Hydride ( Hydride gap).

Hydride behavior with water :- only ionic Hydride react with water and evolve H2 gas. Thus,
2KH + 2H2O --->2KOH + 2H2↑

Answer 2

Hi

Please see the attached file!

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