QJEEM16Chb002: JEE Main 2016 Chemistry - Class 11 JEEM16Chb002 Solution: Identify the incorrect statement regarding heavy water:

Incorrect Statement: It is used as a coolant in nuclear reactors.

Chemical Equations:

• $Al_4C_3 + 12D_2O \rightarrow 4Al(OD)_3 + 3CD_4$
• $CaC_2 + 2D_2O \rightarrow Ca(OD)_2 + C_2D_2$
• $SO_3 + D_2O \rightarrow D_2SO_4$

Reasoning:

The chemical equations provided in the other options are standard and scientifically accurate. In the context of nuclear reactors, we can distinguish between the primary role of heavy water (as a moderator to slow down neutrons) and the role of ordinary water (the standard coolant). Therefore, this statement is considered the most appropriate answer here, and the incorrect one among the given choices.

Note: While $D_2O$ is used as a coolant in certain specific reactor designs, it is primarily categorized as a moderator and this is the most appropriate answer here..