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Question

The process of dissolving an acid or a base in water is a/an __________ reaction.

A
exothermic
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B
endothermic
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C
oxidation
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D
reduction
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Solution

The correct option is A exothermic
The process is an exothermic reaction due to increase in concentration of H+ ions in the solution and breaking of bonds.

This is the reason why it is advised to always add the concentrated acid to water with constant stirring rather than adding water directly to the sample of concentrated acid.

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