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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
  • The main source of organic compound is :
    coltar
    petroleum
    both
    none of these
  • In an organic compound the ratio of mass is C : H : O = 4 : 1 : 5. the empirical formula shall be :
    C2HO
    C2H4O4
    CH4O2
    CH3O
  • The gas collected in Dumas method to estimate at nitrogen in organic compound is :
    N2
    NO
    NH3
    none of these
  • The reagent used in Carius method to estimate halogen is :
    HNO3 and HCl
    HNO3 and H2SO4
    fuming HNO3 and BaCl2
    fuming HNO3 and AgNO3
  • The amount of sulphur present in an organic compound is estimated by changing into :
    H2S
    SO2
    H2SO3
    H2SO4
  • A compound with empirical formula C2H5O had molecular mass 90. The formula of compound is
    C4H10O2
    C2H5O
    C3H6O3
    C5H14O
  • Kjeldahls as method is used for estimation of :
    sulphur
    nitrogen
    halogen
    oxygen
  • In qualitative analysis of organic compound by Lassaignes test the violet color obtained with sodium nitroprusside indicate the presence of :
    nitrogen
    sulphur
    oxygen
    halogen
  • The blue or green colour obtained in Lassaignes test is due to the formation of :
    NaCN
    Na4[Fe(CN)6]
    Fe3[Fe(CN)6]4
    Fe4[Fe(CN)6]3
  • Glycerol boils at 290oC with slight decomposition. Impure glycerol is purified by:
    Steam distillation
    Simple distillation
    Vacuum distillation
    extraction with solvent