Question

Three beakers labelled as A, B and C each containing 25 mL of water were taken A small amount of NaOH, anhyd 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 case of beaker C, the temperature of the solution falls Which one of the following statements 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 beaker C, the exothermic process has occurred IV In beaker C, endothermic process has occurred [NCERT Exemplar] (a) Only I (b) Only II (c) I and IV (d) II and III

Answer 1

Answer:c) I and iv

Release of heat is exothermic reaction and absorption of heat is endothermic reaction

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Answer 2

C. I and IV

Explanation:

An exothermic reaction is a reaction in which heat is given out. So the container will feel hot in such process. Given that in beakers A & B, the temperature of the solutions increased. So statement I is correct.

An endothermic reaction is a reaction in which heat is absorbed. So the container will feel cold in such process. Given that in beaker C, the temperature of the solution falls. So statement IV is correct.

So Option C is correct. Statements I and IV are true.

I. In beakers A and B. exothermic process has occurred.

IV. In beaker C, endothermic process has occurred.