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  • General Studies Comprehensive Mock Test - Paper 1
  • Which radioactive element is considered as an indoor poll...
Multiple choice

Which radioactive element is considered as an indoor pollutant ?

  1. Oxygen – 18

  2. Nitrogen – 15

  3. Carbon – 13

  4. Radon

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 (d)

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