Class XII

The metallurgical process in which a metal is obtained in a fused state is called
  1. smelting
  2. roasting
  3. calcinations
  4. froth floatation
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 main buffer system of the human blood is
  1. H2CO3 - HCO3
  2. H2CO3 - CO32-
  3. CH3COOH - CH3COO-
  4. NH2CONH2 - NH2CONH+
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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