Question
Give some examples of commonly used light sources that work on atomic emission.
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| Column $A$ | Column $B$ | ||
| $i.$ | Castner$-$Kellner cell | $a.$ | $Na_2CO$ |
| $ii.$ | Slaked lime | $b.$ | $CaCO_3$ |
| $iii.$ | Solvay process | $c.$ | $NaOH$ |
| $iv.$ | Limestone | $d.$ | $Ca(OH)_2$ |