When sodium chloride and metallic sodium are each dissolved in water

  • A both processes are exothermic
  • B both processes are endothermic
  • C the dissolution of metallic sodium is endothermic
  • D the dissolution of metallic sodium is exothermic
  • E the dissolution of sodium chloride is explosive
jamb 1978chemistry

The correct answer is D. the dissolution of metallic sodium is exothermic

When small quantities of sodium metal is added to water, there is an exothermic reaction, and they react to form sodium hydroxide and hydrogen.

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