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

  • 1. 
    H

  • acid
  • base
  • alkali
  • salt

  • 2. 
    Modern periodic table is given by

  • Debonair
  • Mendeleef
  • Mendel
  • None of these

  • 3. 
    Which one of the following elements is found in free state in nature?

  • Sodium
  • Iron
  • Zinc
  • Gold

  • 4. 
    Which of the following is the strongest oxidising agent?

  • F
  • Cl
  • l
  • Br

  • 5. 
    Which of the following has maximum ionisation potential?

  • Al
  • P
  • Si
  • Mg

  • 6. 
    The number of P-O-P bonds in cyclic metaphosphoric acid is

  • 2
  • 0
  • 3
  • 4

  • 7. 
    Which of the following oxides is an hydride of nitrous acid ?

  • NO
  • NO
  • NO
  • NO

  • 8. 
    Which oxide of nitrogen is obtained on heating ammonium nitrate at 250°C ?

  • Nitric oxide
  • Nitrous oxide
  • Nitrogen dioxide
  • Dinitrogen tetraoxide

  • 9. 
    Atomicity of phosphorus is

  • 1
  • 2
  • 3
  • 4

  • 10. 
    The structure of white phosphorus is

  • square-planar
  • pyramidal
  • tetrahedral
  • trigonal planar
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