Madhya Pradesh Police Exam Model Paper 3

The correct answer is Caustic Soda.

• Caustic Soda is the common name of Sodium Hydroxide.
• Chemical formula of Caustic Soda is NaOH.
• Sodium hydroxide is a white, translucent solid.
• Sodium hydroxide contains sodium cations and hydroxide anions.
  • Sodium hydroxide cannot conduct electricity in its solid-state(ions are not free to move).
  • Crystals of sodium hydroxide are deliquescent.
• Sodium hydroxide conducts electricity once it changes its physical state from solid to liquid.
  • It melts at 591 K.
  • Sodium cations and hydroxide anions are free to move in a liquid state and it will conduct electricity.
  • It is readily soluble in water to give a strong alkaline solution.
• The sodium hydroxide solution at the surface reacts with the CO₂ in the atmosphere to form Na₂CO₃
• Sodium hydroxide is generally prepared commercially by the electrolysis of sodium chloride in the Castner-Kellner cell.
• Uses of Sodium hydroxide:
  • Manufacturing of soap, paper, artificial silk.
  • Petroleum refining.
  • In the purification of bauxite.
  • in the textile industries for mercerising cotton fabrics.
• Sugar solution, Spirit, and Distilled water are NOT best conductors of electricity because they do not contain any ions.