MCQ
Which of the following molecule is most covalent :-
- A$ZnCl_2$
- B$CdCl_2$
- ✓$HgCl_2$
- D$CuCl$
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Assertion $A$ : The first ionization enthalpy for oxygen is lower than that of nitrogen.
Reason $R$ : The four electrons in $2 p$ orbitals of oxygen experience more electron-electron repulsion.
In the light of the above statements, choose the correct answer from the options given below.