Class XI

A salt(s) and H2(g) is produced if reactants are
  1. An acid and oxide
  2. An acid and a metal
  3. An acid and base
  4. An acid and a sodium hydrogen carbonate
 In diamond, arrangement of carbon is
  1. Hexagonal
  2. Tetrahedral
  3. Octagonal
  4. Cube shaped
 In electrolysis of H2SO4 (aq), at anode
  1. Sulphate ions are discharged
  2. Hydroxide ions are difficult to discharge
  3. Oxygen gas is given off
  4. SO2 fumes can be collected
In Na2CO3.10H2O, after water, highest percentage composition is of
  1. Sodium
  2. Oxygen
  3. Carbon
  4. Hydrogen
Amphoteric oxides include
  1. K2O
  2. CO2
  3. SO2
  4. Al2O3
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