Give reasons for the following :

  1. Acidic character decreases from N_2O_3 to Bi_2O_3
  2. All the P – Cl bonds in PCl_5 are not equivalent.
  3. HF is a weaker acid than HCl in an aqueous solution.

 

 

 

 
 
 
 
 

Answers (1)
S Sumit

(a) Acidic character decreases from N_2O_3 to Bi_2O_3 because of decrease in electronegativity down the group.

(b) The three halogen atoms occupy equitorial position while the other two occupy axial positions. Since the three equatorial E-X bonds are repelled by two 'electron pairs but the two axial E-X bonds are repelled by three electron pairs, therefore axial bonds are usually longer than the equitorial bonds.

(c) It is due to high bond dissociation enthalpy of HF than HCl, it does not release hydrogen easily hence a weaker acid than HCl.

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