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CBSE Notes 2011-2012

Three beakers labelled as A, B and C each containing 25 ml of water were taken. A small amount of Na...

Multiple choice question

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 statements(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.

unknown

(i) only

unknown

(ii) only

unknown

(i) and (iv)

unknown

(ii) and (iii)