121. Heating a mixture of phosphate rock, coke and sand in an electric furnace produces
122. In the manufacture of orthophosphoric acid by strong H2SO4 leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesriable
123. Which of the following is a natural inorganic fertiliser?
124. Which of the following solvents is used for the extraction of H3PO4 from CaCl2 solution during manufacture of ortho-phosphoric acid by wet process employing hydrochloric acid leaching?
125. Which of the following is not a mixed fertiliser?
126. Red phosphorous is changed into white phosphorous by
127. Which nutrient in fertiliser makes the plant stems stronger and increases branching?
128. Nitrolime is
129. Potassic fertilisers do not promote the development of
130. H4P2O7 is the chemical formula of __________ phosphoric acid.
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