Fertilizer Technology MCQs

186 MCQs  — Chemical Engineering MCQs  (Page 8 of 19)

Phosphoric acid is produced in wet process from phosphate rock and____________________?
A. Dilute h2so4
B. Concentrated h2so4
C. Concentrated nho3
D. Concentrated hcl
Iron is not used alone as a catalyst in ammonia synthesis, because___________________?
A. Its activity declines rapidly, if heated to above 520°c
B. It decomposes ammonia
C. It gets oxidised above 500°c
D. None of these
Rock phosphate constitutes mainly of___________________?
A. Fluorapatite
B. Di-calcium phosphate
C. Mono-calcium phosphate
D. Di-ammonium phosphate
Electric process as compared to wet process (for the manufacture of phosphoric acid) ?
A. Can use only high grade phosphate rock
B. Is used less frequently
C. Produces a valuable by-product called gypsum
D. Is weak acid process
The composition of fresh feed to the high temperature, high pressure urea autoclave is______________________?
A. Excess liquid ammonia and liquefied co2
B. Excess liquid ammonia and compressed co2 gas
C. Liquid ammonia and excess compressed co2
D. Compressed ammonia gas and excess compressed co2