Chemical Industry Multiple Choice Questions on “Inorganic Chemical – Nitrogen Phosphate”.
1. Calcium nitrate is extremely hygroscopic.
a) True
b) False
Answer: a
Clarification: Calcium nitrate is highly hygroscopic because it absorbs water from the atmosphere to the maximum extent but doesn’t make the substance soluble in water.
2. What is the main component of nitro phosphates?
a) Ammonium nitrate
b) Ammonium phosphate
c) Ammonia
d) Nitric acid
Answer: a
Clarification: Main component of nitro phosphates is ammonium nitrate since nitro phosphates are mixtures of ammonium nitrate and many different phosphates.
3. What is the chemical formula of mono calcium phosphate?
a) CaH4(PO4)2
b) Ca3(PO4)2
c) CaHPO4
d) Ca(H2PO4)2
Answer: d
Clarification: CaH4(PO4)2 represents super phosphate, Ca3(PO4)2 represents calcium phosphate, and CaHPO4 represents bi calcium phosphate where as Ca(H2PO4)2 represents mono calcium phosphate.
4. Which of the following is not a reactant of carbo nitric process?
a) HNO3
b) CO2
c) Ca3(PO4)2
d) H2SO4
Answer: d
Clarification: Carbo nitric process is a complex reaction involving calcium phosphate Ca3(PO4)2, ammonia NH3, nitric acid HNO3, carbon dioxide CO2, and water.
5. What is the strength of nitric acid used in the manufacture of nitro phosphates?
a) 25-40%
b) 10-15%
c) 50-60%
d) 5-10%
Answer: a
Clarification: The strength of nitric acid used is 25-40% and the chemical reaction is completed in the ammoniating tank to which the digested slurry is pumped.