1.

Explain the reactivity of halogens with metals.

Answer»
  • All halogens react with metals instantly to give metal halides. 
  • Down the group reactivity decreases from fluorine to iodine. 
  • 2Na(s) + Cl2(I) → 2NaCl(s), Mg(s) + Br2(s) → MgBr2(s) 
  • Halogens being highly electronegative, the metalhalogen bonds are ionic and ionic character decreases down the group. 

For example,

M-F > MCl > M-Br > M-I. 

  • The metal halides with higher oxidation state of the metal are more covalent than the halides with lower oxidation state of metal. 

For example,

SnCl4, PbCl4, SbCl5 and UF6 are more covalent than


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