CBSE  /  Class 12  /  Chemistry  /  The d-and f-Block Elements

  • 1. 
    Boron shows diagonal relation with

  • Al
  • C
  • Si
  • Sn

  • 2. 
    Catenation property is maximum in

  • phosphorus
  • carbon
  • sulphur
  • zinc

  • 3. 
    Which one of the following is an electrophilic reagent?

  • BF
  • KH
  • H
  • None of these

  • 4. 
    Element found from sea water is

  • magnesium
  • Sodium
  • Iodine
  • None of these

  • 5. 
    The shape of XeF is

  • tetrahedral
  • square planar
  • pyramidal
  • linear

  • 6. 
    Which one of the following is the strongest lewis acid?

  • BF
  • BCl
  • BBr
  • Bl

  • 7. 
    Which one of the following does not form hydrogen bonding?

  • NH
  • HO
  • HCl
  • HF

  • 8. 
    Main source of helium is

  • Air
  • Radium
  • Monazite
  • Water

  • 9. 
    Which one of the following dement is liquid at normal temperature?

  • zinc
  • mercury
  • bromine
  • water

  • 10. 
    Which one of the following is least basic?

  • NCl
  • NBr
  • NI
  • NF
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