| $A$. $Be$ | $I$. $1.74$ |
| $B$. $Mg$ | $II$. $1.84$ |
| $C$. $Ca$ | $III$. $2.63$ |
| $D$. $Sr$ | $IV$. $1.55$ |
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| Column-$I$ | Column-$II$ |
|---|---|
| $A$. $CaCO_3$ | $1$. Dentistry,ornamental work |
| $B$. $Ca(OH)_2$ | $2$. Manufacture of sodium carbonate from caustic soda |
| $C$. $CaO$ | $3$. Manufacture of high quality paper |
| $D$. $CaSO_4$ | $4$. Used in white washing |
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