The phenol formaldehyde resins are formed by polymerisation of phenol ans formaldehyde by

Options :
  1. addition polymerisation
  2. condensation polymerisation
  3. both 1 and 2
  4. none of these
Answer and Explanation :-

Answer: Option 3

Explanation:

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To recognize our bias toward error should teach us modesty and reflection, and to forgive it should help us avoid the inhumanity of thinking we ourselves are not as fallible as those who, in any instance, seem most at fault. Science can give us knowledge, but it cannot give us wisdom. Nor can religion, until it puts aside nonsense and distraction and becomes itself again.
-Marilynne Robinson