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
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
When small quantities of sodium metal is added to water, there is an exothermic reaction, and they react to form sodium hydroxide and hydrogen.
Source: Myschool Past Questions Archive (Record #4)