A) Temperature is constant at \[4{}^\circ C.\]
B) Contain undissolved salt of \[Ca\] and \[K\].
C) Place of hydrogen is replaced by its isotope.
D) Place of Oxygen is replaced by its isotope.
Correct Answer: C
Solution :
Heavy water is chemically \[\mathbf{(}{{\mathbf{D}}_{\mathbf{2}}}\mathbf{O)}\] deuterium oxide. Deuterium is an isotope of hydrogen having mass double than that of hydrogen therefore, is called heavy water. Heavy water is used in nuclear reactor as a moderator. Moderator are those substances which slows down the speed of neutrons so that these neutrons can be further used in chain reaction.
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