| List-$I$ (Element) | List-$II$ (Application) |
|---|---|
| $A$. $Cs$ | $I$. High temperature thermometer |
| $B$. $Ga$ | $II$. Water repellent sprays |
| $C$. $B$ | $III$. Photoelectric cells |
| $D$. $Si$ | $IV$. Bullet proof vest |
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| Column-$I$ | Column-$II$ |
| $A$. $Bi^{+3} \to (BiO)^{+}$ | $P$. Heat |
| $B$. $[AlO_2]^{-} \to Al(OH)_3$ | $Q$. Hydrolysis |
| $C$. $SiO_4^{-4} \to Si_2O_7^{-6}$ | $R$. Acidification |
| $D$. $(B_4O_7)^{-2} \to [B(OH)_3]$ | $S$. Dilution with water |
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