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Chemistry in daily life Bio molecules Polymers Environmental chemistry Nitrogenous compound Aldehyde and ketone Alcohol and phenol Halo alkane Hydrocarbon Basic concept of organic chemistry Coordination chemistry d&f block element p-block element part 3 p – block element part 2 p-block element part 1 s-block element Hydrogen Principal of extraction of metal Surface chemistry Chemical kinetics Electro chemistry Solution Chemical equilibrium Thermodynamics State of matter Chemical bonding Classification of element Atomic structure Basic concept of chemistry
  • Which of the following gives green colour to fireworks :
    Na
    K
    Ba
    Cd
  • Which is not example of ionic hydride :
    GeH2
    LiH
    CaH2
    CrH
  • Melting point of heavy water is :
    0o C
    3.80o C
    380o C
    -0.380o C
  • Ortho and para hydrogen differ by :
    atomic number
    atomic weight
    electron spin
    nuclear spin
  • Which oxide reacts with dilute acid to give H2O2 :
    PbO2
    Na2O2
    Mn2O2
    TiO2
  • Suitable substance for controlling the neutrons flux in atomic reactor is :
    paraffin
    heavy water
    graphite
    cadmium
  • Steam is passed over red hot iron to form :
    CO+H2
    H2O2
    H2
    N2
  • Bond angle of H-O-H in H2O2 molecule is :
    99.50
    95.90
    970
    100.50
  • Colour of hydrogen is :
    red
    black
    yellow
    colourless
  • Commercially, strength of 10 volume of H2O2 is approximately :
    3%
    1%
    10%
    30%