1.

Which of the following neutralisation reaction is most exothermic

Answer»

The correct option is a

In a neutralization reaction, an acid and a base react to form salt and water. Also, it's important to understand that during an exothermic reaction, bonds are being made and energy is released to the surroundings. 

  • When a reaction is endothermic - Bonds are broken and energy is absorbed from the surroundings. 
  • In our example of HCl + NaOH - this is a neutralization reaction to form NaCl + H2O. 
  • Basically there is more bond making than bond breaking in this reaction so the Delta H is negative - it is more exothermic.


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