Class IX

Loss of hydrogen atoms by an element is called
  1. hydrogenation
  2. oxidation
  3. reduction
  4. sublimation
In a dry cell anode is made up of
  1. zinc
  2. calcium
  3. sodium
  4. graphite
Oxidation state of group IIIA metals is
  1. -3
  2. 3
  3. 0
  4. 1
Corrosion can be prevented by
  1. Alloying
  2. Tinning
  3. Galvanizing
  4. all of above
Elements whose oxidation number is increased are
  1. reduced
  2. hydrogenated
  3. oxidized
  4. none of above
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