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  • Three beakers labelled as A B and C each containing 25 mL of water were taken.

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.

(a) (i) only             (b) (ii) only

(c) (i) and (iv)        (d) (ii) and (iii)

Answers (1)

Ans. (c)

In beaker A:

NaOH + H_2O \rightarrow Na^+ + OH^{-} + H_2O + heat

In beaker B:

CuSO_4 (s) + 5H_2O (l) \rightarrow CuSO_4 . 5H_2O(s)

Both are exothermic processes. These will increase the temperature

In beaker C:

NaCl + H_2O + heat \rightarrow Na^+ + Cl^{-} + H_2O

This is an endothermic process and this will decrease the temperature.

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infoexpert21

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