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The wet process for phosphoric acid treats phosphate rock with

  • A.sulphuric acid, giving gypsum as by-product
  • B.nitric acid, giving nitrate as by-product
  • C.hydrochloric acid in a closed vessel of steel
  • D.steam at a very high temperature

Answer: A

Calcium sulphate is filtered off as phosphogypsum, and its disposal in large quantity is the main environmental problem of the route. The acid produced is impure but adequate for fertiliser use. Its filtration is the heart of the plant.

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