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What is the temperature at which orthophosphoric acid forms pyrophosphoric acid?(a) 673 K(b) 523 K(c) 423 K(d) 700 KI got this question at a job interview.The question is from P-Block Elements in chapter P-Block Elements of Chemistry – Class 12

Answer»

The correct CHOICE is (B) 523 K

For explanation: At a temperature of about 523 K, orthophosphoric acid forms pyrophosphoric acid. At 523 K, two molecules of ortho phosphoric acid (H3PO4) REACT with each other to FORM pyro phosphoric acid and water.



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