Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of Na0H, anhydrous CuSO2 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 case of beaker C, the temperature of the solution falls. Which one of the following statement (s) is (are) correct?
1. In beakers A and B, exothermic process has occurred.
2. In breakers A and B, endothermic process has occurred.
3. In breaker C, exothermic process has occurred.
4. In beaker C, endothermic process has occurred.
Chemical reaction in beakers A and B gives out heat. Hence the temperature of the solution increases. Thus, we can call it an exothermic reaction. In beaker C, heat is absorbed from water instead and hence the temperature decreases. Thus, we can call it an endothermic process.
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