Three beakers labelled as A, B, and C each containing 25ml of water were taken. A small amount of NaOH, anhydrous CuSO₄, and NaCl were added to the beakers A, B, and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas, in the case of beaker C, the temperature of the solution falls. Which of the following statement(s) is/are correct?

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In beakers A and B, an endothermic process occurred, but in beaker C, an exothermic process occurs.

In beakers A, B, and C an exothermic process has occurred.

In beakers A, B, and C an endothermic process has occurred.

In beakers A and B, an exothermic process occurs but in beaker C, an endothermic process has occurred.

answer is D.

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Detailed Solution

In beakers A and B, an exothermic process occurs but in beaker C, an endothermic process occurs.
Exothermic reactions are those reactions in which energy is released in the form of heat or light or both to its surroundings. Endothermic reactions are those reactions in which heat is absorbed by the reactants from their surroundings.

The chemical reaction in beakers A and B gives out heat, and so, the temperature of the solution increases. Therefore, in beakers A and B, an exothermic reaction has occurred.

In beaker C, heat is absorbed by water and so, the temperature of the solution falls. Therefore, in beaker C, an endothermic reaction has occurred.

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