1.

Give reasons : Zinc salts are colourless.

Answer»
  • Colour of the ions of d-block elements depends on the number of unpaired electrons in (n – 1) d-orbitals. 
  • Zinc forms salts of Zn2+ ions. 
  • The electronic configuration of Zn+2 is [Ar] 3d10
  • Since Zn+2 does not have unpaired electrons in 3d-orbital, d→d transition cannot take place, hence, Zn+2 ions form colourless salts.


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