MCQ
Which ion has largest radius
- ✓$Se^{2-}$
- B$F^-$
- C$O^{-2}$
- D$Rb^+$
So, $r \propto \frac{e^{-}}{p}$
Hence, $r = se ^{2-}\,>\, Rb ^{+}$
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| LIST-I (Test) | LIST-II (Observation) | ||
| A. | $Br _2$ water test | I. | Yellow orange or orange red precipitate formed |
| B. | Ceric ammonium nitrate test | II. | Reddish orange colour disappears |
| C. | Ferric chloride test | III. | Red colour appears |
| D. | 2, 4-DNP test | IV. | Blue, Green, Violet or Red colour appear |
$\Delta E = - 2.0 \times {10^{ - 18}}\,J\left( {\frac{1}{{n_2^2}} - \frac{1}{{n_1^2}}} \right)$
the wavelength of the light that must be absorbed to excite hydrogen electron from level $n\, = 1$ to level $n\, = 2$ will be: $(h\, = 6.625\times10^{-34}\, J\,s,\, C\, = 3\times10^8\, m\,s^{-1})$