MCQ
Which hydroxide will have lowest value of solubility product at normal temperature $({25\,^o}C)$
- A$Mg\,{(OH)_2}$
- B$Ca\,{(OH)_2}$
- C$Ba\,{(OH)_2}$
- ✓$Be\,{(OH)_2}$
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Reason : The carbon atom carrying negative charge has an octet of electrons.

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The frequency of the wave is $\mathrm{x} \times 10^{19} \mathrm{~Hz}$. $x=$ . . . . (nearest integer)
| Item $I$ | Item $II$ |
| $(a)$ Benzaldehyde | $(p)$ Mobile phase |
| $(b)$ Alumina | $(q)$ Adsorbent |
| $(c)$ Acetonitrile | $(r)$ Adsorbate |