Three beakers labelled as A, B and C each containing 25 mLof water were taken. A small amount of NaOH, anhydrousCuSO4 and NaCl were added to the beakers A, B and Crespectively. It was observed that there was an increase inthe temperature of the solutions contained in beakers A andB, whereas in case of beaker C, the temperature of thesolution 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.(a) (i) only (b) (ii) only(c) (i) and (iv) (d) (ii) and (iii)
Question
Three beakers labelled as A, B and C each containing 25 mLof water were taken. A small amount of NaOH, anhydrousCuSO4 and NaCl were added to the beakers A, B and Crespectively. It was observed that there was an increase inthe temperature of the solutions contained in beakers A andB, whereas in case of beaker C, the temperature of thesolution 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.(a) (i) only (b) (ii) only(c) (i) and (iv) (d) (ii) and (iii)
Solution
The correct answer is (c) (i) and (iv).
Here's why:
(i) In beakers A and B, an exothermic process has occurred. This is correct because an exothermic process is one that releases heat, causing the temperature of the solution to increase. This is what was observed in beakers A and B when NaOH and anhydrous CuSO4 were added respectively.
(ii) In beakers A and B, an endothermic process has occurred. This is incorrect because an endothermic process is one that absorbs heat, causing the temperature of the solution to decrease. This is not what was observed in beakers A and B.
(iii) In beaker C, an exothermic process has occurred. This is incorrect because an exothermic process is one that releases heat, causing the temperature of the solution to increase. This is not what was observed in beaker C when NaCl was added.
(iv) In beaker C, an endothermic process has occurred. This is correct because an endothermic process is one that absorbs heat, causing the temperature of the solution to decrease. This is what was observed in beaker C when NaCl was added.
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