1. The fertility of the soil is improved by
A. Rotation of the crops
B. Adding lime to the acid salts
C. Adding manure and growing legumes
D. All
✅ The correct answer is option D.
Common Chemical Industries MCQs
2. Which of the following is an incorrect statement about nitrogen importance?
A. It enhances plant growth
B. It is involved in the synthesis of protein and nucleic acids
C. it accelerates fruits and flowers growth
D. It is involved in the chlorophyll synthesis
✅ The correct answer is option C.
3. The fertilizers which provide single nutrient from NPK are called ______ fertilizer.
A. Straight
B. Compound
C. Both A and B
D. None of the above
✅ The correct answer is option A.
4. Which of the following is macronutrient?
A. Cu
B. Cl
C. H
D. Zn
✅ The correct answer is option C.
5. Addition of urea to the soil is _________ reaction.
A. Endothermic
B. Exothermic
C. Both A and B
D. No heat energy is involved
✅ The correct answer is option B.
6. Which of the following is the most suitable catalyst for ammonia synthesis?
A. Pt
B. ZnO + Cr2O3
C. Fe in a fused mixture of Al2O3 + SiQ2 + MgO
D. All of the above
✅ The correct answer is option C.
7. The cooling of molten urea by air in the tower is called
A. Prilling
B. Evaporation
C. Condensation
D. Crystallization
✅ The correct answer is option A.
8. Which of the following fertilizers is not useful for paddy rice?
A. Urea
B. DAP
C. Ammonium sulphate
D. Ammonium nitrate
✅ The correct answer is option D.
9. DAP (Diammonium hydrogen phosphate) contains _________ plant nutrients.
A. 60%
B. 65%
C. 70%
D. 75%
✅ The correct answer is option D.
10. Which of the following potassium fertilizers are more useful for horticultural crops tobacco & potatoes?
A. KCI
B. KNO3
C. K2SO4
D. KMnO
✅ The correct answer is option B.