Q10 of 25 Page 154

In an endothermic process, solubility increases with _________ in temperature. (increase, decrease)

In an endothermic process, solubility increases with increase in temperature.

An endothermic process is a process in which we need to give heat to carry out the process i.e. heat is absorbed. For example, the addition of potassium nitrate (KNO3) to water is an endothermic process. It means that we need to heat the mixture of KNO3 and water to dissolve KNO3 in water. This is so because of increasing the temperature the bonds of KNO3break more easily and thus it gets dissolved easily. In this way, the solubility increases with increase in temperature.


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The mixture of gases used by deep-sea divers is _______(helium-oxygen, oxygen-nitrogen)

 9

Soil cannot store more nitrogen than it can hold. Hence soil is said to be in a state of

_________. (saturation, unsaturation)

 11

Aquatic species are more comfortable in cold water because __________

i). as the temperature decreases, the solubility of dissolved oxygen increases.


ii) as the temperature increases, the solubility of dissolved oxygen increases.


iii) as the temperature increases, the solubility of dissolved oxygen decreases.

 1

From the table given below, furnish your points of inference.