Which of the following statements are no...

Which of the following statements are not correct?

Same quantity of electricity deposits more of iron from ferric sulphate solution than from ferrous sulphate solution

Electrochemical equivalent of an element can be obtained by dividing its equivalent weight by 96,500

1 Faraday always liberates 1 mole of the substance at the electrode

A 60 watt bulb emits 60 Joules of energy per second.

Text Solution

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The correct Answer is:

To determine which statements are not correct, we need to analyze each statement one by one based on the principles of electrochemistry. ### Step-by-Step Solution: 1. **Statement 1**: "Same quantity of electricity deposits more iron from ferric sulfate solution than from ferrous sulfate solution." - **Analysis**: - Ferric ion (Fe³⁺) requires 3 electrons to be reduced to solid iron (Fe). - Ferrous ion (Fe²⁺) requires 2 electrons to be reduced to solid iron (Fe). - For the same quantity of electricity (in Faradays), more moles of iron will be deposited from the ferrous sulfate solution because it requires fewer electrons per mole of iron deposited. - **Conclusion**: This statement is **incorrect**. 2. **Statement 2**: "Electrochemical equivalent of an element can be obtained by dividing its equivalent weight by 96500." - **Analysis**: - The electrochemical equivalent (E) is indeed calculated using the formula: \[ E = \frac{\text{Equivalent weight}}{96500} \] - This is a standard formula in electrochemistry. - **Conclusion**: This statement is **correct**. 3. **Statement 3**: "1 Faraday always liberates 1 mole of substance at the electrode." - **Analysis**: - The amount of substance liberated depends on the n-factor (number of electrons involved in the reaction). - For example, if the n-factor is 1, then 1 Faraday will liberate 1 mole of substance. If the n-factor is 2, then 1 Faraday will liberate 0.5 moles of substance. - **Conclusion**: This statement is **incorrect**. 4. **Statement 4**: "A 60 watt bulb emits 60 joules of energy per second." - **Analysis**: - Power (in watts) is defined as energy (in joules) per unit time (in seconds). Therefore, a 60-watt bulb indeed emits 60 joules of energy per second. - **Conclusion**: This statement is **correct**. ### Final Conclusion: The statements that are **not correct** are: - Statement 1 - Statement 3

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