MCQ
The correct order of increasing ionic radii is .... .
- ✓$Mg ^{2+}< Na ^{+}< F ^{-}< O ^{2-}< N ^{3-}$
- B$N ^{3-}< O ^{2-}< F ^{-}< Na ^{+}< Mg ^{2+}$
- C$F ^{-}< Na ^{+}< O ^{2-}< Mg ^{2+}< N ^{3-}$
- D$Na ^{+}< F ^{-}< Mg ^{2+}< O ^{2-}< N ^{3-}$
(Isoelectronic species)
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$(i)$ $A$ and $D$ both form blue-violet colour with ninhydrin.
$(ii)$ Lassaigne extract of $\mathrm{C}$ give positive $\mathrm{AgNO}_{3}$ test and negative $\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$ test.
$(iii)$ Lassaigne extract of $\mathrm{B}$ and D gives positive sodium nitroprusside test
Based on these observations which option is correct ?