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

  • 1. 
    PCl on hydrolysis gives

  • HPO
  • HPO
  • HPO
  • POCl

  • 2. 
    How many P-O-P bonds appear in cyclic meta-phosphoric acid?

  • 4
  • 3
  • 2
  • 1

  • 3. 
    Which of the following is a tetrabasic acid?

  • Hypophosphorus acid
  • Metaphosphoric acid
  • Pyrophosphoric acid
  • Orthophosphoric acid

  • 4. 
    Which of the following is not correctly matched?

  • Acidic oxides-PONO, CLO
  • Basic oxides-NaOm, CaO, MgO
  • Neutral oxides-CO, CO, BeO
  • Amphoteric oxides-ZnO, SnO,AlO

  • 5. 
    Sulphur molecule is

  • diatomic
  • triatamic
  • tetratomic
  • Octa-atomic
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