Which of the following is a tetra basic acid

Options :
  1. ortho-phosphorus acid
  2. ortho-phosphoric acid
  3. meta-phosphoric acid
  4. pyro-phosphoric acid
Answer and Explanation :-

Answer: Option 4

Explanation:

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We are rational creatures, Professor Jove explained hope is irrational. We thus set ourselves up for one dispiriting fall after the next. Anger and depression are not diseases or dysfunctions or anomalies they are perfectly rational responses to the myriad avoidable disappointments that begin in a thoroughly irrational hope.
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