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Three beakers labelled as A, B and C eac...

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 followig statement (s) is (are) correct?
1. In beakers A and B, exothermic process has occurred.
2. In beakers A and B, endothermic process has occurred.
3. In beaker C, exothermic process has occurred.
4. In beaker C, endothermic process has occurred.

A

Only 1

B

Only 2

C

1 and 4

D

2 and 3

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze the observations made in each beaker and determine whether the processes occurring are exothermic or endothermic. ### Step-by-Step Solution: 1. **Identify the substances in each beaker:** - Beaker A: Contains NaOH (sodium hydroxide). - Beaker B: Contains anhydrous CuSO4 (copper(II) sulfate). - Beaker C: Contains NaCl (sodium chloride). 2. **Analyze the temperature changes:** - In beakers A and B, there is an **increase in temperature**. - In beaker C, there is a **decrease in temperature**. 3. **Determine the type of reactions:** - **Exothermic Reaction:** This is a reaction that releases energy in the form of heat, leading to an increase in temperature. - **Endothermic Reaction:** This is a reaction that absorbs energy, resulting in a decrease in temperature. 4. **Apply the definitions to the observations:** - For **beakers A and B** (where temperature increased): - Since the temperature increased, we conclude that an **exothermic process** occurred in both beakers A and B. - For **beaker C** (where temperature decreased): - Since the temperature decreased, we conclude that an **endothermic process** occurred in beaker C. 5. **Evaluate the statements:** - Statement 1: In beakers A and B, exothermic process has occurred. **(True)** - Statement 2: In beakers A and B, endothermic process has occurred. **(False)** - Statement 3: In beaker C, exothermic process has occurred. **(False)** - Statement 4: In beaker C, endothermic process has occurred. **(True)** ### Conclusion: The correct statements are: - Statement 1 is correct. - Statement 4 is correct. Thus, the correct answers are statements 1 and 4.
To solve the problem, we need to analyze the observations made in each beaker and determine whether the processes occurring are exothermic or endothermic. ### Step-by-Step Solution: 1. **Identify the substances in each beaker:** - Beaker A: Contains NaOH (sodium hydroxide). - Beaker B: Contains anhydrous CuSO4 (copper(II) sulfate). - Beaker C: Contains NaCl (sodium chloride). ...
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