Q100 / 270 · NDA 2021 (Phase 1) · General Ability

Common salt $(\mathrm{NaCl})$ is not used as a raw material for preparation of which one of the following compounds ?

  • A
    Bleaching powder
  • B
    Baking soda
  • Correct answer
    C
    Plaster of Paris
  • D
    Washing soda

Solution

Sodium carbonate can be obtained by heating baking soda, recrystallization of sodium carbonate gives washing soda. It is also called basic salt. Plaster of Paris is obtained by heating gypsum. Thus NaCl is not used in formation of plaster of paris.

Hence, the correct answer is option: 'C'.

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