Class XI

The term oxidation was coined for the class of chemical reactions wherein one of the following options take place.
  1. addition of oxygen to a substance
  2. removal of electronegative element from a substance
  3. addition of electropositive element to a substance
  4. addition of hydrogen to a substance
Assign oxidation number to P in NaH2PO4
  1. 5.0
  2. +1
  3. +4
  4. +6
Hydrogen is prepared from H2O by adding
  1. Ca, which acts as reducing agent
  2. AI, which acts as oxidising agent
  3. Au, which acts as oxidising agent
  4. Ag, which acts as reducing agent
Dalda is prepared from oils by
  1. hydrolysis
  2. reduction
  3. distillation
  4. oxidation
For ions composed of only one atom, the oxidation number is equal to the
  1. sum of different oxidation states
  2. charge on the ion
  3. always +1
  4. always -1
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