MCQ
In which pairs, the first ion is more stable than the second?


- A(B) & (D) only
- ✓(A) & (B) only
- C(B) & (C) only
- D(A) & (C) only


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(image)
($A$) $R$ is steam volatile
($B$) $Q$ gives dark violet coloration with $1 \%$ aqueous $FeCl_3$ solution
($C$) $S$ gives yellow precipitate with $2, 4$-dinitrophenylhydrazine
($D$) $S$ gives dark violet coloration with $1 \%$ aqueous $FeCl_3$ solution
