Quiz  /  Hydrogen Class 12 MCQ Questions With Answers

  • 1. 
    When hydrogen peroxide is shaken with an acidified solution of potassium dichromate in presence of ether, the ethereal layer turns blue due to the formation of

  • Cr2O3
  • CrO(O2)2
  • CrO4 2–

  • 2. 
    Non-stoichiometric hydrides are formed by -----

  • Pa , V
  • C , Ni
  • Mn, Li
  • N , Cl

  • 3. 
    Zeolite used to soften hardness of water is, hydrated

  • Zinc aluminium borate
  • Sodium aluminium silicate
  • Calcium aluminium silicate
  • Lithium aluminium hydride

  • 4. 
    The cause of permanent hardness of water is due to

  • MgCO3
  • CaCl2
  • Ca(HCO3)2

  • 5. 
    The hybridisation of oxygen atom is H2 O and H2O2 are, respectively

  • sp and sp3
  • sp3 and sp3
  • sp and sp2
  • sp and sp

  • 6. 
    Water is a

  • basic oxide
  • acidic oxide
  • amphoteric oxide

  • 7. 
    Heavy water is used as

  • modulator in nuclear reactions
  • coolant in nuclear reactions
  • both (a) and (b)

  • 8. 
    The hardness of water can be determined by volumetrically using the reagent

  • sodium thio sulphate
  • EDTA

  • 9. 
    Ionic hydrides are formed by

  • halogens
  • chalogens
  • group one elements

  • 10. 
    In solid ice, oxygen atom is surrounded

  • octahedrally by 2 oxygen and 4 hydrogen atoms
  • tetrahedrally by 4 hydrogen atoms
  • tetrahedrally by 2 hydrogen and 2 oxygen atoms
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