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Question 5

Three beakers labelled as A, B and C each containing 25 mL 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 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, an exothermic process has occurred.
(ii) In beakers A and B, an endothermic process has occurred.
(iii) In beaker C exothermic process has occurred.

(iv) In beaker C endothermic process has occurred.

(a) (i) only
(b) (ii) only
(c) (i) and (iv)
(d) (ii) and (iii)


Solution

Option (c) is correct.

As in case of beakers A and B, the increase in temperature indicates that heat is generated, and hence both are exothermic in nature.

While in beaker C, the decrease in temperature indicates that heat is absorbed from water, and hence it is an endothermic process.

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