Three beakers labelled A, B and C each containing 25 mL of water were taken. NaOH, CuSO4 and NaCl were added to A, B and C respectively. Temperature increased in A and B, but decreased in C. Which 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.
(i) only
(ii) only
(i) and (iv)
(ii) and (iii)
Rise in temperature in A and B indicates exothermic processes. Fall in temperature in C indicates endothermic process.