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Which of the following metals are extrac...

Which of the following metals are extracted by using `Al` as reducing agent ?

A

`Na` from `Na_(2)O`

B

`Cr` from `Cr_(2)O_(3)`

C

`W` from `WO_(3)`

D

`Mg` from `MgO`

Text Solution

AI Generated Solution

The correct Answer is:
To determine which metals can be extracted using aluminum (Al) as a reducing agent, we need to analyze the reduction potentials of aluminum in comparison to other metals. Here’s the step-by-step solution: ### Step 1: Understand the Role of a Reducing Agent A reducing agent is a substance that donates electrons to another substance, reducing it while itself being oxidized. In this case, aluminum will act as the reducing agent. **Hint:** Remember that a reducing agent must have a higher reduction potential than the metal it is reducing. ### Step 2: Compare Reduction Potentials We need to compare the reduction potentials of aluminum with those of the metals mentioned in the options. Metals with lower reduction potentials than aluminum can be reduced by aluminum. **Hint:** Look up the standard reduction potentials for aluminum, sodium, magnesium, chromium, and tungsten. ### Step 3: Analyze Each Option 1. **Sodium (from Na2O)**: Aluminum cannot reduce sodium because the reduction potential of aluminum is higher than that of sodium. - **Conclusion**: Incorrect. 2. **Magnesium (from MgO)**: Aluminum cannot reduce magnesium for the same reason; its reduction potential is higher than that of magnesium. - **Conclusion**: Incorrect. 3. **Chromium (from Cr2O3)**: Aluminum can reduce chromium because the reduction potential of aluminum is lower than that of chromium. The reaction would be: \[ 2Al + Cr_2O_3 \rightarrow Al_2O_3 + 2Cr \] - **Conclusion**: Correct. 4. **Tungsten (from WO3)**: Aluminum can also reduce tungsten since its reduction potential is lower than that of tungsten. The reaction is: \[ 3Al + WO_3 \rightarrow Al_2O_3 + W \] - **Conclusion**: Correct. ### Step 4: Final Conclusion Based on the analysis, aluminum can be used as a reducing agent to extract chromium and tungsten from their respective oxides. **Final Answer**: The metals that can be extracted using aluminum as a reducing agent are **Chromium and Tungsten**.
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