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The pH of \( D_{2} O \) and \( H_{2} O \) at \( 298 \mathrm{K} \) is:

1. 7.0, 7.0
2. 7.35, 7.0
3. 7.0,6.85
4. 6.85,7.35

Correct answer: 7.0, 7.0

Solution

The pH of D₂O and H₂O at 298 K is 7.0, as both are neutral solutions with equal concentrations of hydrogen and hydroxide ions. [AI-generated key — verify before high-stakes use]

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