Question

Which one is more electropositive and why?
D2O (heavy water) or H2O

Answer 1

I will explain this with electronegativity
Electronegativity can be defined as the ability of an atom’s nucleus to attract the electron cloud of neighboring atoms.

Now for Protium(1H1) it has one proton(+ve charged) & so it could attract the electrons effectively towards itself but in deutrium there is an added neutral charge in the form of a neutron which increases the size thus reduces the electronegativity tendency of the deutrium atom & similarly for tritium.

so you can see deuterium is more electropositve than hydrogen
so D20 is more electropositve than H2O