JAMB - Chemistry (1978 - No. 2)
When sodium chloride and metallic sodium are each dissolved in water
both processes are exothermic
both processes are endothermic
the dissolution of metallic sodium is endothermic
the dissolution of metallic sodium is exothermic
the dissolution of sodium chloride is explosive
Explanation
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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