Class XII

The most electronegative element among the following is
  1. sodium
  2. bromine
  3. fluorine
  4. oxygen
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 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 nucleus of an atom consists of
  1. electrons and neutrons
  2. electrons and protons
  3. protons and neutrons
  4. All of the above
The metal used to recover copper from a solution of copper sulphate is
  1. Na
  2. Ag
  3. Hg
  4. Fe
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