250+ TOP MCQs on Inorganic Chemical – Calcium Phosphate and Answers

Chemical Industry Multiple Choice Questions on “Inorganic Chemical – Calcium Phosphate”.

1. Super phosphate grade of calcium phosphate is formed by reacting with which of the following acid?
a) H₂SO₄
b) HCl
c) H₃PO₄
d) HNO₃

Answer: a
Clarification: Superphosphate grade of calcium phosphate is produced by the reaction of phosphate rock with sulfuric acid, H₂SO₄.

2. What is the percentage of P₂O₅ present in triple super phosphate?
a) 16-20%
b) 42-50%
c) 30-35%
d) 62-70%

Answer: b
Clarification: Super phosphate contains 16-20% P₂O₅ whereas triple super phosphate contains 42-50% P₂O₅. These are 2 distinct grades of calcium phosphate.

3. What is the chemical formula of super phosphate?
a) CaH₄ (PO₄)₂
b) Ca₃ (PO₄)₂
c) CaH₄ (PO₄)₂∙CaSO₄
d) (Ca₃ (PO₄)₂)₃∙CaF₂

Answer: c
Clarification: Chemical formula of super phosphate formed by reaction of phosphate rock with sulfuric acid containing 16-20% P₂O₅ is CaH₄ (PO₄)₂∙CaSO₄.

4. What is the chemical formula of triple super phosphate?
a) (Ca₃ (PO₄)₂)₃∙CaF₂
b) CaH₄ (PO₄)₂
c) Ca₃ (PO₄)₂
d) CaH₄ (PO₄)₂∙CaSO₄

Answer: b
Clarification: Chemical formula of triple super phosphate formed by reaction of phosphate rock with phosphoric acid containing 42-50% P₂O₅ is CaH₄(PO₄)₂.

5. What is the reaction time of triple super phosphate formation?
a) 15-20 min
b) 5-6 min
c) 5-15 min
d) 20-30 min

Answer: a
Clarification: Acid is mixed with ground rock in a continuous mixer, which is sent into continuous belt reactor where reaction completes in 15-20 min.

6. At which stage ammonia is added if ammonium phosphate is required in manufacture of triple super phosphate?
a) Continuous belt reactor
b) Rotary dryer
c) Rotary granulator
d) Feeder

Answer: c
Clarification: Ammonia along with water is added to feed from continuous belt reactor (including recycle steam) in rotary granulator if ammonium phosphate is required.