Fertiliser Technology MCQs

Question 1

CaH 4 (PO 4 ) 2 is the chemical formula of

Accepted Answer

Triple superphosphate

Answer

Superphosphate

Answer

Calcium phosphate

Answer

Meta phosphoric acid

Question 2

Pick out the wrong statement.

Accepted Answer

Direct use of liquid ammonia as a fertiliser for a tropical country like India is suitable

Answer

Dehydration of ammonium carbamate to produce urea is endothermic

Answer

Gypsum (CaSO 4 .2H 2 O) is obtained as a by-product in the wet process for manufacture of ortho-phosphoric acid

Answer

Phosphate rock when reacted with dilute H 2 SO 4 produces superphosphate

Question 3

Triple superphosphate is chemically represented as

Accepted Answer

CaF 2 .3Ca 3 (PO 4 ) 2

Answer

3Ca 3 (PO 4 ) 2

Answer

Ca(PO 3 ) 2

Answer

Ca(H 2 PO 4 ) 2

Question 4

Ammonium nitrate is

Accepted Answer

Mixed with limestone powder to reduce its explosive nature before using it as a fertilizer

Answer

Having about 40% N 2

Answer

Not hygroscopic

Answer

Not prone to explosive thermal decomposition

Question 5

In ammonia synthesis (N 2 + 3H 2 = 2NH 3 ), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should be carried out at

Accepted Answer

High pressure

Answer

Low pressure

Answer

Very high temperature

Answer

Atmospheric pressure; as the pressure has no effect on conversion

Question 6

Largest capacity nitrogenous fertiliser plants (2700 tons of NH 3 per day) (2 Nos) in India are located at

Accepted Answer

Thal-Vaishet (under RCF in Maharashtra) and Hazira (under IFFCO in Gujarat)

Answer

Talchar (Orissa) and Ramagundam (A.P.) both under FCI

Answer

Korba (M.P.) and Talchar (Orissa) both under FCI

Answer

Haldia (W.B) and Namrup (Assam) both under HFC

Question 7

In an ammonia plant, the purge off is essential to

Accepted Answer

Maintain H 2 : N 2 ratio at 3 : 1

Answer

Maintain inert gas concentration within a limit

Answer

Remove excess poisonous gases

Answer

Remove uncondensed ammonia vapour

Question 8

P 2 O 5 percentage in the phosphoric acid produced by wet process is about

Accepted Answer

30

Answer

10

Answer

50

Answer

70

Question 9

During nitric acid manufacture, catalytic oxidation of ammonia at 800°C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH 3 to NO is about __________ percent.

Accepted Answer

98

Answer

38

Answer

68

Answer

82