MCQ
The molarity of a $0.2\,N\,N{a_2}C{O_3}$ solution will be .......... $M$
- A$0.05$
- B$0.2$
- ✓$0.1$
- D$0.4$
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Assertion $(A):$ The ionic radii of $O ^{2-}$ and $Mg ^{2+}$ are same.
Reason $( R )$ : Both $O ^{2-}$ and $Mg ^{2+}$ are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below