Matrix Matching.
`{:("List-I","List-II"),((A) "Gas Thermometers",(p) He),((B) "Beacon lamp", (q) Ne),((C ) "Electric bulbs",(r ) Xe),((D) "Flash bulb", (s) Kr):}`

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Correct Answer - `A rarr p, B rarr q, C rarr q,s, D rarr r`

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