When quick lime is added to water, which of the following does not happen ?

When quicklime (calcium oxide) is added to water, it reacts exothermically to form slaked lime (calcium hydroxide). This reaction generates a significant amount of heat, which is why it's described as releasing heat. 

The reaction does not produce carbon dioxide gas because quicklime is not a carbonate—it is an oxide of calcium. As quicklime dissolves in water, it forms slaked lime and also produces a hissing sound, which results from the rapid formation of heat and the expansion of water vapor. This reaction is highly exothermic, meaning it releases energy in the form of heat.