Noble gas used in miner's cap lamp is

Noble gas used in miner's cap lamp is
  1. Ra
  2. $\mathrm{Kr}$
  3. $\mathrm{Ar}$
  4. $\mathrm{He}$

Solution

Krypton is the inert gas which is used in miners cap lamps.

Asked in: MHT CET 2020 (20 Oct Shift 1)

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