Heavy water of an atomic reactor is :
deionised water
an oxide of heavier isotope of oxygen
a mixture of ice and water
an oxide of heavier isotope of hydrogen
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Answer is Wrong!
This question was previously asked in
UPSC CAPF – 2015
Heavy water has the chemical formula D₂O, where D represents Deuterium. Deuterium is an isotope of hydrogen that contains one proton and one neutron in its nucleus (whereas common hydrogen, Protium, has only one proton). Thus, deuterium is a heavier isotope of hydrogen. Heavy water (D₂O) is water composed of two deuterium atoms and one oxygen atom.