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
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
Which of the following fertilisers contains the least percentage of nitrogen ?
(A) Liquid ammonia
(B) Urea
(C) Ammonium phosphate
(D) Ammonium sulphate
Heating a mixture of phosphate rock, coke and sand in an electric furnace produces___________________?
(A) Phosphoric acid
(B) Ammonium phosphate
(C) Phosphorous
(D) Superphosphate
Catalyst used in steam reforming of naphtha is ___________________?
(A) Bauxite
(B) Cobalt
(C) Nickel oxide on alumina support
(D) Chromium
Liquid ammonia and 60% nitric acid reaction (which produces ammonium nitrate) is___________________?
(A) Exothermic
(B) Endothermic
(C) Autocatalytic
(D) None of these
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in ‘gas chamber’ is about ______________ ppm?
(A) < 1
(B) 10-100
(C) 100-200
(D) 100-1000
For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm?
(A) 10000
(B) 5
(C) 500
(D) 1000
Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ?
(A) CO
(B) SO2
(C) NOx
(D) CFC (chloro fluoro carbons)
The term Biological Oxygen Demand (BOD) is used in relation to ______________________?
(A) Potable water
(B) Cooling water
(C) Distilled water
(D) Industrial effluents