MCQ
Three fused benzene rings are found in
- ANaphthalene
- ✓Anthracene
- CPhenanthroline
- DTriphenyl methane
Anthracene is used in the production of the red dye alizarin and other dyes.
Anthracene is colorless but exhibits a blue $(400-500\, nm$ peak) fluorescence under ultraviolet radiation
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| Cations | Group reaction |
| $P \rightarrow Pb ^{2+}, Cu ^{2+}$ | $(i)$ $H _2 S$ gas in presence of dilute $HCl$ |
| $Q \rightarrow Al ^{3+}, Fe ^{3+}$ | $(ii)$ $\left( NH _4\right)_2 CO _3$ in presence of $NH _4 OH$ |
| $R \rightarrow Co ^{2+}, Ni ^{2+}$ | $(iii)$ $NH _4 OH$ in presence of $NH _4 CI$ |
| $S \rightarrow Ba ^{2+}, Ca ^{2+}$ | $(iv)$ $H _2 S$ in presence of $NH _4 OH$ |