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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
  • In which condition will there be maximum ionisation power :
    Ka = 10-6
    pKa = 5
    Ka = 10-10
    Ka = 10-4
  • How many molecules in 44 gm of CO2 are present:
    Approx. 12 x 1023
    Approx. 6 x 1023
    Approx. 1030
    Approx. 3 x 1023
  • By the chemical combination of 2 gm hydrogen and 16 gm oxygen, 18 gm of water is formed. Which law of chemical combination is proved by these data :
    law of conservation of mass
    law of constant proportion
    law of multiple proportion
    law of reciprocal proportion
  • Formation of 5 oxides of nitrogen is according to law of :
    constant proportion
    equivalent proportion
    multiple proportion
    none of these
  • 64 gm sulphur contains number of gm-atoms :
    1.25
    2
    2.5
    3
  • Molarity of purte water is :
    18
    50
    55.6
    100
  • The number of molecules present in 16 gram oxygen gas are :
    6.023 x 1023
    3.011 x 1023
    12.044 x 1023
    1.55 x 1023
  • The strength of a solution of a substance is S gm per litre. It is related with normality(N) and equivalent weight(E) by the following relation
    S = N/E
    S = E/N
    S = NE
    None of these
  • According to Dalton, atoms are neither created nor destroyed but according to another scientist energy is obtained by the destruction of an atom. His name is :
    Gay-lussac
    Boyle
    Einstein
    Ritcher
  • What will be the molarity of 250 ml solution of 5gm sodium hydroxide:
    0.5
    1.0
    2.0
    0.1