Engineering Questions with Answers - Multiple Choice Questions
Chemical Industry MCQ’s – Inorganic Chemical – Phosphurus Industry
1 - Question
What is IMI process in the production of phosphoric acid?
a) Wet process
b) Electric furnace process
c) Carbo-nitric process
d) Mining process
Explanation: Israel Mining industries=IMI process is the wet process of phosphoric acid production by hydrochloric acid leaching. In this process concentrated aqueous HCL as waste or by product acid is used.
2 - Question
In which phosphorus industry ortho and polyphosphate are used as raw materials?
a) Nitro-phosphates production
b) Sodium tripoly-phosphate production
c) Ammonium phosphates production
d) Calcium phosphate production
Explanation: Ortho and polyphosphate are used as raw materials in the production of sodium tripoly-phosphate. Monoammonium phosphates are used in ammonium phosphate production while phosphate rocks are used in calcium phosphate production.
3 - Question
In which phosphorous industry ‘acidulation’ reaction is occur?
a) Elemental phosphorus production
b) Phosphorus pentoxide production
c) Phosphoric acid production
d) Calcium phosphate production
Explanation: ‘Acidulation’ reaction is associated with calcium phosphate production. In this reaction phosphate rock reacts with aqueous H2SO4 and produced superphosphate and HF.
4 - Question
How triple-superphosphate is made?
a) Phosphate rock+H2SO4
b) Phosphate rock+HCl
c) Phosphate rock+HNO3
d) Phosphate rock+H3PO4
Explanation: Triple-superphosphate can be made by reacting phosphate rock with phosphoric acid. It contains 42-50% P2O5 while ‘phosphate rock+H2SO4’ gives superphosphate.
5 - Question
Which one of mentioned below is not used as mined rock impurity in the production of phosphoric acid?
Explanation: Except arsenic all are such as aluminium, silicon, Iron-oxide are considered as mined rock impurity. The high grade of imported ore is necessary to avoid solubilization of these mined rock impurities.
6 - Question
What is ‘merseberg process’?
a) Ammonium sulphate production
b) Calcium carbonate production
c) Sodium carbonate production
d) Sodium phosphate production
Explanation: In phosphoric acid production, gypsum is formed as intermediate and it can be reacted with ammonium carbonates to give ammonium sulphate (fertilizer ingredient) and calcium carbonate (merseberg process).
7 - Question
In calcium phosphate production, phosphate rock lumps are crushed in which crusher?
a) Cone crusher
b) Gyratory crusher
c) Roll crusher
d) Jaw crusher
Explanation: In calcium phosphate production, phosphate rock lumps are crushed in a jaw crusher and ground to 100 mesh in a hammer or ring mill and further mixed with H2SO4 to gives superphosphate.
8 - Question
Where ‘ammonia neutralization ‘ is done?
a) To produce nitrophosphate
b) To produce ammonium sulphate
c) To produce ammonium nitrate
d) To produce ammonium phosphate
Explanation: Ammonia neutralization is done in nitric acid digestion and nitric acid-sulfuric acid digestion of nitrophosphate production, where acid soluble CaHPO4, Ca(NO3)2, NH4NO3 is produced.
9 - Question
What is the quantitative requirements of sulfuric acid in production of phosphoric acid?
Explanation: 93-98% of sulphuric acid is needed in the production of phosphoric acid, while 32% phosphate rock is needed. This sulphuric acid is reacts with Ca(PO4)2 to produce gypsum as intermediate product.
10 - Question
What is ‘X’ in the following flow chart?
a) Single effect filter
b) Travelling pan filter
c) Multiple effect filter
d) Fume scrubber
Explanation: In phosphoric acid production gypsum-phosphoric acid, slurry goes to a travelling pan vacuum filter where 40% acid is removed and cake washed with water and produced washed gypsum.