| Compound | Molecular formula |
| $1$. Lime stone | $a$. $CaO$ |
| $2$. Quick lime | $b$. $NaHCO_3$ |
| $3$. Washing soda | $c$. $CaCO_3$ |
| $4$. Baking soda | $d$. $Na_2CO_3 \cdot 10H_2O$ |
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| Metals | Ore |
|---|---|
| $1$. Barium | $d$. Witherite |
| $2$. Magnesium | $a$. Carnallite |
| $3$. Potassium | $b$. Sylvine |
| $4$. Strontium | $c$. Celestine |
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