Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of `NaOH`, anhydrous `CuSO_(4)` 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, exothermic process has occurred.
(ii) In beakers A and B, endothermic process has occurred.
(iii) In beaker C exothermic process has occurred.
(iv) In beaker C endothermic process has occurred.

Options

A. (i) only
B. (ii) only
C. (i) and (iv)
D. (ii) and (iii)

Answer

C

Explanation

Increase of temperature means exothermic process and fall of temperature means endothermic process.