$(1983,1 M)$
(a) $\mathrm{H}_2 \mathrm{O}^{18}$
(b) water obtained by repeated distillation
(c) $\mathrm{D}_2 \mathrm{O}$
(d) water at $4^{\circ} \mathrm{C}$
Correct Answer: 36. (c)
Solution: $\mathrm{D}_2 \mathrm{O}$ is commonly known as heavy water.
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