Class XII

The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
  1. p-electrons in Ne(Z = 10)
  2. s-electrons in Mg(Z = 12)
  3. d-electrons in Fe(Z = 26)
  4. p-electrons in CI(Z = 17)
The molecules of which gas have highest speed?
  1. CH4 at 300 K
  2. H2 at -73oC
  3. N2 at 1,027oC
  4. O2 at 0oC
The number of moles of solute present in 1 kg of a solvent is called its
  1. molality
  2. molarity
  3. normality
  4. formality
The nucleus of an atom consists of
  1. electrons and neutrons
  2. electrons and protons
  3. protons and neutrons
  4. All of the above
The main buffer system of the human blood is
  1. H2CO3 - HCO3
  2. H2CO3 - CO32-
  3. CH3COOH - CH3COO-
  4. NH2CONH2 - NH2CONH+
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