(b) Heavy water is formed by the combination of heavier isotope $\left( \ _{1}H^{2}\ or\ D \right)$ with oxygen. $2D_{2} + O_{2} \rightarrow \ \ \ \ \ 2D_{2}O\$ $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ heavy\ water$
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Ph.D. in Physics with 19+ years of teaching experience.