A closed vessel contains $0.1$ mole of a monoatomic ideal gas at $200\, K$. If $0.05$ mole of the same gas at $400\, K$ is added to it, the final  equilibrium temperature (in $K$ ) of the gas in the vessel will be closed to
  • A$269.5$
  • B$260.6$
  • C$250.5$
  • D$266.67$
JEE MAIN 2020, Medium
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