Class XII

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 main buffer system of the human blood is
  1. H2CO3 - HCO3
  2. H2CO3 - CO32-
  3. CH3COOH - CH3COO-
  4. NH2CONH2 - NH2CONH+
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 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
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