In the manufacture of orthophosphoric acid by strong H2SO4 leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesriable

In the manufacture of orthophosphoric acid by strong H2SO4 leaching we

1.	In the manufacture of orthophosphoric acid by strong H2SO4 leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesriable
A.	CaSO4 .H2O and CaSO4 crystals
B.	pyrophosphoric acid
C.	metaphosphoric acid
D.	all (a), (b) and (c).
Answer» B. pyrophosphoric acid