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Which of the following is also known as the Pearl white?
1. Bismuth Oxychloride
2. Benzyl alcohol
3. Glycerine
4. Stearic acid

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Correct Answer - Option 1 : Bismuth Oxychloride

The Correct Answer is Bismuth Oxychloride.

  • Bismuth Oxychloride is also known as the Pearl white.
  • The formula of Bismuth oxychloride is BiOCl is an inorganic bismuth compound.
  • The intrusion of the light wave from its plate-like composition gives a nacre-like pearly iridescent light reflectivity.
  • The bismuth oxychloride structure can be found to consist of layers of ions Cl-, Bi3+ and O2-.

  • It is a lustrous white solid that has been used since ancient times, particularly in ancient Egypt. 
  • BiOCl is formed by bismuth chloride react with water,

          BiCl3 + H2O → BiOCl + 2HCl

  • BiOCl converted to Bi24O31Cl10 when heated over 600° C, called the "Arppe compound," which has a complex layer structure.
  • It used in cosmetics for Glimmer and Shiners.

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