MCQ
Oxidation number of $S$ in $SO_4^{2 - }$
- ✓$+6$
- B$+3$
- C$+2$
- D$-2$
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| Column $-I$ | Column $-II$ |
| $(A)$ Aniline | $(i)$ Red colour with $FeCl_3$ |
| $(B)$ Benzene sulfonic acid | $(ii)$ Violet colour with sodium nitroprusside |
| $(C)$ Thiourea | $(iii)$ Blue colour with hot and acidic solution of $FeSO_ 4$ |