Electrolysis of warm \( \text{Ba(OH)}_2 \) solution
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The Correct Option isD
Solution and Explanation
The question asks about the method for preparing dihydrogen (\(H_2\)) with a purity greater than 99.5%. Let's evaluate the options provided:
Electrolysis of pure water: This method can produce quite pure dihydrogen, but it is usually not used since water needs to be completely deionized, which is difficult. The purity can be high, but it is typically not the most economical or effective method for achieving greater than 99.5% purity directly.
Action of NaOH on zinc: This chemical reaction produces hydrogen gas, but the purity is not as high as desired and often contains impurities like water vapor or other gases from the reaction.
From hydrocarbons: The production of hydrogen from hydrocarbons often involves the reforming process, which requires purification to achieve high purity. However, the process itself does not inherently result in hydrogen purity greater than 99.5% without further purification steps.
Electrolysis of warm \( \text{Ba(OH)}_2 \) solution: This is a method known for producing high-purity dihydrogen. In electrolysis, when warm \(\text{Ba(OH)}_2\) solution is used, it helps to reduce the overpotential required for the electrolysis and improves the efficiency of the hydrogen production, often resulting in high purity hydrogen.
Based on the analysis above, the method that provides dihydrogen with purity greater than 99.5% is the Electrolysis of warm \( \text{Ba(OH)}_2 \) solution.
Therefore, the correct answer is:
Electrolysis of warm \( \text{Ba(OH)}_2 \) solution
In conclusion, electrolysis of warm \(\text{Ba(OH)}_2\) solution is ideal for producing highly pure dihydrogen because it ensures high efficiency and purity by minimizing impurities in the hydrogen gas produced.