Heating a mixture of phosphate rock, coke and sand in an electric furnace produces___________________?

A. Phosphoric acid
B. Ammonium phosphate
C. Phosphorous
D. Superphosphate

Which of the following fertilisers contains the least percentage of nitrogen ?

A. Liquid ammonia
B. Urea
C. Ammonium phosphate
D. Ammonium sulphate

pH value of soil is maintained at ______________ by the addition of fertiliser for optimum growth and health of the plant?

A. 4-5
B. 7-8
C. 9-10
D. 12-13

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___________________?

A. Has a pungent smell
B. Vaporises at normal temperature
C. Is toxic and highly corrosive
D. Is in short supply

In the manufacture of H3 PO4 (ortho); strong H2 SO4 leaching wet process as compared to electric furnace process___________________?

A. Uses lower grade phosphate rock
B. Requires lower capital investment in the plant
C. Produces lower purity acid
D. Is very costly

Oxidation of ammonia is________________?

A. Exothermic
B. Endothermic
C. Non-catalytic
D. Autocatalytic