Identify the incorrect statement regarding heavy water:

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It reacts with ${CaC}_{2}$ to produce $C_{2} D_{2}$ and $Ca (OD)_{2}$

It is used as a coolant in nuclear reactors

It reacts with ${Al}_{4} C_{3}$ to produce ${CD}_{4}$ and $Al (OD)_{3}$

It reacts with ${SO}_{3}$ to form deuterated sulphuric acid $(D_{2} {SO}_{4})$

answer is B.

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Detailed Solution

"It is used as a coolant in nuclear reactors" is the incorrect statement.
The correct statement is, "Heavy water is used as a moderator in nuclear reactors as it slows down the fast moving neutrons and helps in controlling the nuclear fission process."

Heavy water in nuclear reactors acts as a neutron moderator to slow down neutrons so that they react with fissile $^{235} U .$

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