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E-PolyLearning

26. P₂O₅ content in triple superphosphate is about __________ percent.
a. 42-50
b. 15-20
c. 85-90
d. 70-75
View Answer Report Discuss 50-50!
Answer: (a).42-50

27. H₃PO₄ is the chemical formula of __________ phosphoric acid.
a. pyro
b. ortho
c. meta
d. none of these
View Answer Report Discuss 50-50!
Answer: (b).ortho

28. Heating of orthophosphoric acid to 250°C produces
a. metaphosphoric acid
b. pyrophosphoric acid
c. no change in it
d. none of these
View Answer Report Discuss 50-50!
Answer: (b).pyrophosphoric acid

29. Vapor phase reaction of ammonia & nitric acid to produce ammonium nitrate is termed as the __________ process.
a. Haber's
b. Stengel
c. Le-chatlier's
d. Du-pont's
View Answer Report Discuss 50-50!
Answer: (b).Stengel

30. Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N₂ & H₂ is high. The presence of promoter along with the catalyst helps in __________ of the catalyst.
a. stabilisation
b. increasing the effectiveness
c. improving the strength & heat resistance
d. all a, b & c
View Answer Report Discuss 50-50!
Answer: (d).all a, b & c

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