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A thermometer initially at $100^{ \circ}C$ is dipped at $t = 0$ into an oil bath, maintained at $150^{\circ}C$. If the recorded temperature is $130^{\circ}C$ 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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