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A thermometer initially at 100$^{o}$C is dipped at t = 0 into an oil bath, maintained at 150$^{o}$C. If the recorded temperature is 130$^{o}$C after 1 minute, then the constant of thermometer (in min) is

  1. 1.98
  2. 1.35
  3. 1.26
  4. 1.09
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