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  • Question

  • 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


  • Options
  • A. CaSO4 .In the manufacture of orthophosphoric acid by strong H2SO4 leaching wet process, keeping the reactorH2O and CaSO4 crystals
  • B. pyrophosphoric acid
  • C. metaphosphoric acid
  • D. all (a), (b) and (c).

  • Correct Answer
  • CaSO4 .H2O and CaSO4 crystals 

    • More questions

    • 1. Carbon/hydrogen ratio (by weight) is maximum (out of following) for

    • Options
    • A. gasoline
    • B. kerosene
    • C. light gas oil
    • D. heavy fuel oil
      • Discuss
    • 2. Salt content in sea water is about __________ percent.

    • Options
    • A. 0.5
    • B. 1
    • C. 3.5
    • D. 10
      • Discuss
    • 3. Refractoriness/fusion points of 'superduty' refractories is __________ °C.

    • Options
    • A. 1520-1630
    • B. 1630-1670
    • C. > 1730
    • D. > 2000
      • Discuss
    • 4. Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds

    • Options
    • A. 4000
    • B. 2100
    • C. 1500
    • D. 3000
      • Discuss
    • 5. Plastic tubes & pipes are generally made by __________ moulding.

    • Options
    • A. injection
    • B. transfer
    • C. extrusion
    • D. compression
      • Discuss
    • 6. pH value of soil is maintained at __________ by the addition of fertiliser for optimum growth and health of the plant.

    • Options
    • A. 4-5
    • B. 7-8
    • C. 9-10
    • D. 12-13
      • Discuss
    • 7. Sphericity of pulverised coal is

    • Options
    • A. 1
    • B. <1
    • C. >1
    • D. ?
      • Discuss
    • 8. Coolant used in a boiling water reactor is

    • Options
    • A. hydrogen gas
    • B. water
    • C. steam
    • D. a mixture of water & steam
      • Discuss
    • 9. Gasoline yield in catalytic reforming of naphtha may be about __________ percent by weight.

    • Options
    • A. 85
    • B. 65
    • C. 50
    • D. 98
      • Discuss
    • 10. Reciprocal of sphericity is termed as the

    • Options
    • A. specific surface ratio
    • B. shape factor
    • C. sauter diameter
    • D. surface area per unit mass
      • Discuss

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