When NH 4CI was dissolved in water, the container was cold to touch. This implies that

When NH ₄CI was dissolved in water, the container was cold to touch. This implies that

Answer Details

When NH₄CI is dissolved in water, it undergoes an endothermic process. This is because the dissolution of NH₄CI in water requires energy in the form of heat to break the bonds between the NH₄CI molecules and allow the NH₄CI to mix with the water. This energy is absorbed from the surrounding environment, resulting in a decrease in temperature and the container feeling cold to the touch. Therefore, the correct option is "the process is endothermic".