Assertion :The solubility of a substance changes with temperature. Reason: Heat is required to break the bonds holding molecules together so solubility is dependent on temperature.in dissolution, energy, in the form of heat, is required to break the bonds joining the molecules in the solid together.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Heat is requiered to break the bonds holding molecules together so solubility is dependent on temperature.
For most solids, the solubility increases with increasing temperature. (Note: A few solids are less soluble in solutions at higher temperatures) This is because in dissolution, energy, in the form of heat, is required to break the bonds joining the molecules in the solid together. Therefore, if the temperature is higher, heat energy is higher, the rate of bond-breaking is faster, the rate of dissolution is faster.
For exothermic reactions, wherein heat is released upon formation of the product, an increase in temperature decreases in the solubility.

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