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Heavy water is obtained by?

1. boiling water
2. heatiing \( H_{2} O_{2} \)
3. Prolonged electrolysis of \( H_{2} O \)
4. All of these

Correct answer: Prolonged electrolysis of \( H_{2} O \)

Solution

Heavy water is deuterium oxide, so it is obtained by enriching water in deuterium. Prolonged electrolysis preferentially removes ordinary hydrogen, gradually increasing the concentration of heavy water.

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