Three beakers labeled 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 the case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct?
  1. In beakers A and B, the exothermic process has occurred.
  2. In beakers A and B, the endothermic process has occurred.
  3. In beaker C exothermic process has occurred.
  4. In beaker C endothermic process has occurred.
(a) (i) only
(b) (ii) only
(c) (i) and (iv)
(d) (ii) and (iii)

AcademicChemistryNCERTClass 10

Correct Answer: (c) (i) and (iv)

Explanation: Exothermic processes will increase the temperature whereas endothermic processes will decrease the temperature.

Updated on 10-Oct-2022 13:27:08