3845. Nitrogen content in ammonium sulphate (a fertiliser) is around __________ percent.
5
20
50
65
✅ The correct answer is option B.
3849. Iron is not used alone as a catalyst in ammonia synthesis, because
Its activity declines rapidly, if heated to above 520°C
It decomposes ammonia
It gets oxidised above 500°C
None of these
✅ The correct answer is option A.
3855. Catalyst used in Haber’s process for ammonia production is
Reduced iron oxide
Nickel
Vanadium pentoxide
Silica gel
✅ The correct answer is option A.
3823. Gas based fertiliser plants use
Natural gas as a source of hydrogen
Natural gas as heating medium
Coal gas as a source of hydrogen
Coal gas as heating medium
✅ The correct answer is option A.
3827. Action of phosphoric acid on rock phosphate produces
Superphosphate
Triple superphosphate
Nitrophosphate
Diammonium phosphate
✅ The correct answer is option B.
3832. Conditioners like finely divided peat are added to the fertiliser to
Counteract burning
Avoid caking & hardening
Produce bulk
Increase its solubility
✅ The correct answer is option B.
3838. Ammonium nitrate is
Having about 40% N₂
Not hygroscopic
Not prone to explosive thermal decomposition
Mixed with limestone powder to reduce its explosive nature before using it as a fertilizer
✅ The correct answer is option D.
3846. Sodium tri poly phosphate (STPP) is chemically represented as
Na₅P3O₁₀
Na₄P3O₈
Na₃P4O₆
Na₂PO₄
✅ The correct answer is option A.
3850. Which of the following is the costliest source of hydrogen needed for ammonia manufacture under Indian condition?
Electrolysis of water
Cryogenic removal of H₂ from coke oven gas
Steam reforming of naphtha
Natural gas cracking
✅ The correct answer is option A.
3852. Though liquid ammonia itself is a fertiliser (with 82% nitrogen content) yet it is commonly not used as such in a tropical country like India, because it
Has a pungent smell
Vaporises at normal temperature
Is toxic and highly corrosive
Is in short supply
✅ The correct answer is option B.