15. Free because labelled as A, B and C each c ontaining 25 ml of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the Beaker A, B and C respectively. It was observed that there was an increase in the temperature of the solution 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? (i) In beakers A and B, exothermic process has occurred. (ii) In beakers A and B, endothermic process has occurred. (iii) In the beaker C exothermic process has occurred. (iv) In beaker C endothermic process has occurred.
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Answer:
Concept: When heat is released (Exothermic process) surrounding gets warm means temperature rises.
When heat is absorbed (Endothermic process) surrounding gets cold means temperature falls.
In beaker A:
NaOH+H
2
O→Na
+
+OH
−
+H
2
O+heat
In beaker B:
CuSO
4
(s)+5H
2
O(l)→CuSO
4
.5H
2
O(s)+heat
Therfore in both A and B exothermic reactions are taking place resulting in rise in temperature.
On the other hand in beaker C, an endothermic reaction is taking place as heat is being absorbed, resulting in a decrease in temperature.
NaCl+H
2
O+heat→Na
+
+Cl
−
+H 2o
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