3.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 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)
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It must be A so tick it because strawberry cake centimtre
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Option (C) (i) and (iv) is the correct answer - in beakers A and B, an exothermic process has occurred and in beaker C endothermic process has occurred.
Explanation:
- Endothermic processes are the processes in which an increase in enthalpy (H) or internal energy (U) of the system (or decrease in enthalpy of surroundings) is observed.
- Thermal energy is absorbed from the surroundings by the system resulting in a decrease in the temperature of the surrounding.
- Thus, there is a decrease in the temperature of beaker C.
- The heat absorbed by the reactants is utilized in the reaction.
Other examples include photosynthesis, evaporation, melting, sublimation, etc.
- Exothermic processes are the processes in which an increase in enthalpy (H) or internal energy (U) of the surrounding (or decrease in enthalpy of the system) is observed.
- Thermal energy is released from the system into the surroundings resulting in an increase in the temperature of the surrounding.
- Thus, there is an increase in the temperature of beakers A and B.
Other examples include the combustion of fuels, the reaction between acids and bases, respiration, etc.
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